View Full Version : 6.5TD MPG Hiway mileage Poll!
Cowracer
03-22-2006, 16:16
Here ya go 16gaSxS...
The DuraBux guys have a MPG poll so lets have one for us 6.5TD owners so we don't feel left out.
Driving on the Highway NOT Towing at 65-70mph what is the MPG (us) are you getting?
1. less than 12 MPG
2. 12-13 MPG
3. 14-15 MPG
4. 16-17 MPG
5. 18-19 MPG
6. 20-21 MPG
7. better than 21 MPG
8. Just looking
Tough Guy
03-22-2006, 20:00
Good Job Mr.Cowracer!! Who doesn't love polling!
Chris
jeffscarstrucks
03-22-2006, 20:23
I haven't been here for a while so I better get caught up! I just checked mine on an empty road trip last week and it was right at 18 mpg.
'93 crew cab dually 5speed un-touched with 150k on the clock. I did order some guages today as I had better pay a little closer with those miles....a little tune up is way over due. Thanks to all who have helped me out in the past , JEFF
I miss this place when I have been gone a while!
GMC Hauler
03-23-2006, 03:24
Can you include the rear gear size... That affects everything
Can you include the rear gear size... That affects everything
GMC; It's true but also driving habits, truck size, 4x4 vs 4x2, tire size, tire inflation, & maintaince all effect your MPG. I'm open to idea's we can set up to 10 questions on a poll. How would a gearing & MPG poll be set up? Any ideas?
GMC Hauler
03-23-2006, 14:22
GMC; It's true but also driving habits, truck size, 4x4 vs 4x2, tire size, tire inflation, & maintaince all effect your MPG. I'm open to idea's we can set up to 10 questions on a poll. How would a gearing & MPG poll be set up? Any ideas?
We'll you hit many, but let's see:
1. SB Reg Cab truck, SB X cab truck, LB Reg CaB truck, LB X Cab Truck, Suburban, Tahoe, other
2. 1500 4x2, 1500 4x4, 2500 4x2, 2500 4x4, 3500 4x2, 3500 4x4, 3500 duals 4x2, 3500 duals 4x4(do all 3500's have duals? if so, delete that portion of the question)
3. Fuel Additive no or then selections which basically find out how many oz additive per gal of diesel (1.7, 1.8, 1.9, 2.0, 2.1, 2.2, 2.3, 2.4, 2.5
)
4. Condition of vehicle: Excellent, Very Good, Good, Fair, Poor
5. Driving habits: Conservative, moderate, Lead foot (and add city/highway to each one of these)
6. Thermostat 160, 180, 190, 195, 200, 205, 210, 215, none
7. Overall rear gearing (rear end gear calculated with tire size to give an effective rear gear) (Gear Vendor guys must calculate this into account to compensate for the gear they are usually in)
8. Stock Air Filter/Replacement upgrade air filter/Cone Air filter
9. Intercooler Large/Intercooler Small/None
10. Mechanical Boost control boost Level 6,8,10,11,12,13,14,15,16,17,18/ ECM Boost Control
11. Kennedy PCM (a option for each level he has), Heath PCM 1.0, 2.0, Westers (and any others I may have forgotten)
12. Exhaust stock/stock kitty removed/stock muffler removed/stock both removed/3.0", 3.5", 4.0", 5.0" (is anyone offering 5"?)
You could probably get rid of question 4, asuming everyone's vehicle is average, or make an individual poll for excellent, very goog, good, fair, and poll (or just make 2 or 3)
I know that still makes 11 left, but it's tough to get rid of any of those...
How many options can each question have for an answer?
GMC;
You can only select one of upto ten questions? so you put the critria in and then you have MPG's. If you have 4 MPG scales for each 10 configuration that would be 40 selections very unwieldly. I think for those of us who have been around awhile we understand that a 4.10 dually K/3500 Crew Cab about 15-16 mpg on Highway is about average. Someone like me who has a C-2500 or C-1500 with 3.42's will get around 19-20 no problem. :)
GMC Hauler
03-23-2006, 15:11
Guess i forgot the most important piece, the actual MPG.
Still, i didn't see it in the answer...How many answers can each question have?
GMC Hauler
03-23-2006, 15:32
GMC;
You can only select one of upto ten questions? so you put the critria in and then you have MPG's. If you have 4 MPG scales for each 10 configuration that would be 40 selections very unwieldly. I think for those of us who have been around awhile we understand that a 4.10 dually K/3500 Crew Cab about 15-16 mpg on Highway is about average. Someone like me who has a C-2500 or C-1500 with 3.42's will get around 19-20 no problem. :)
It can be, but if you represent it in a list format like a spreadsheet that has the vehicles listed in ascending order of MPG, and let the options be listed next to the mpg, It will show the trends in the data.
I know it would be a daunting task, but if there is enough interest, I would be willing to collect the data and represent it in graphs, ect
Artworks
03-23-2006, 17:48
of course my mileage is in canadaian gals. ( 4.56 Liters vs, 4 Liters per ) but not whole lot difrence. my truck is basic not modified (yet ) with AMG engine (30,000 Kl) got 19.5 with 4 x engaged on 585 kl trip 70 kl were in city driving and 20 min. at idle in a snow filled ditch (DUH)! Get 18mpg pulling 18 ft. car trailer with '78 belair on it. So figure with a few mods 21 plus. whish me luck
CareyWeber
03-24-2006, 07:11
I voted 18 mpg, but there is a condition to get 18 mpg. I have to limit my speed to no faster than 65 mph. If I go over 65 mph my best is in the 16 - 17 range, and if I hit 75 mph it goes lowerrrrrrrr.
I base my MPG # on repeatable numbers that I have obtained lots of times not a one time think that might have a foaming factor adding or subtracting from the actual MPG #.
Carey
It can be, but if you represent it in a list format like a spreadsheet that has the vehicles listed in ascending order of MPG, and let the options be listed next to the mpg, It will show the trends in the data.
I know it would be a daunting task, but if there is enough interest, I would be willing to collect the data and represent it in graphs, ect
Basicly you have a question and up to ten responses. We have limited choices on the polls. I think to do what you want it would be better if you started a thread and we can stick it so it stays near the top. Ask for the data to be put in a certain order like 1. Vehical (C-2500, Sub-1500 ect.)
2. gearing (3.42) 3. 2x4 or 4x4. ect. Then you could periodicly collect your data and make up a spread sheet. After a reasonalbe time frame for reasonses you could then post the findings.
I was trying to make a straigh forward simple poll, I see the befit of collecting all the data you would like. I don't think we can do it with the standard Poll and it's limits.
moondoggie
03-24-2006, 14:07
[font=times][size=+]Good Day!
19.6, 2003
20.1, 2004
Bone stock 6.5, 4L80-E, 4.10 gears, various size tires (see link below) (all mpg's corrected for tire size - all data within 1% accuracy), Gear Vendors Aux. OD (see link below).
GMC Hauler's questions:
1. LB X Cab Truck
2. 2500 4x4
3. Fuel Additive: Stanadyne Power Formula
chickenhunterbob
03-25-2006, 07:54
I have converted my figures to US gallons, it's pretty easy, even for me
http://www.onlineconversion.com/fuel_consumption.htm
My usual speed on highway is 62 MPH, or 100 KPH, which will reliably result in 20 MPG with occasional tanks as high as 22.5.
All driving combined (city and highway) based on fuel and miles for an entire year in each of the first two years I have owned the old truck is 17.58.
Dihrdbowti
03-25-2006, 18:05
I get 20-21. I drive approx 70 but then again that's 1800-1900 rpm's. See signature for details.
GMC Hauler
03-26-2006, 16:42
Basicly you have a question and up to ten responses. We have limited choices on the polls. I think to do what you want it would be better if you started a thread and we can stick it so it stays near the top. Ask for the data to be put in a certain order like 1. Vehical (C-2500, Sub-1500 ect.)
2. gearing (3.42) 3. 2x4 or 4x4. ect. Then you could periodicly collect your data and make up a spread sheet. After a reasonalbe time frame for reasonses you could then post the findings.
I was trying to make a straigh forward simple poll, I see the befit of collecting all the data you would like. I don't think we can do it with the standard Poll and it's limits.
Ok, give me a few days to put something together. Then, I'll make a post which you can stick to the top.
Cowracer
04-05-2006, 06:17
GMC Hauler made a much more definative MPG post, so I am closing this post.
Tim
GMC Hauler made a much more definative MPG post, so I am closing this post.
Tim
I thought about this Poll and reopened it as the DuraBux MPG Poll has been around and opened so that folks can add their results to improve the amount of info. This is a much more basic and quick Poll to respond too.
surburban with the 6.5 around 23
wrecker with 6.5 around 16 mpg ,5 speed with 4.10 gears
rollback with 6.5 around 11 mpg ,5 speed and 4.41 gears
Truckie117
05-16-2006, 08:06
Were sorry to hear that you are in canada vote to become the 52nd state JK.
Were sorry to hear that you are in canada vote to become the 52nd state JK.
This one has me perplexed? :confused:
But I am confuse easlie.
DmaxMaverick
05-16-2006, 11:26
Uhhhh. Yeah.....
Chevrolet4x4s
08-14-2006, 19:36
This one has me perplexed? :confused:
But I am confuse easlie.
I think that they are counting Iraq as the 51st state....I Guess
Shane
Well, I get about 9.8 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.
bcbigfoot
09-28-2006, 21:34
I have a 93 2500 extended cab long box, 2 wheel drive, 4l80e trans, 3.42 gears non posi full floater rearend, tires are 265/75 16 ltx michelins, F engine, original pump and injectors with 170,000 miles. Its getting 20mpg on the US gal.
xtrempickup
12-25-2006, 20:45
I looked at this thread briefly, I have a couple questions. I'm running a stock 95 GMC Sierra 6.5L Turbo diesel ext cab 6ft bed automatic trans with 152K miles and my truck rides on 315/70/17 in tires with completely stock gears to my knowledge. Normally In town I get about 11-12 miles to the gallon and I have mainly stop and go and some highway, mostly on and off the brakes. I do a little better on the highway, but not a whole load, maybe 2 mpg better. What is the standard PSI that these truck's turbos push.? I don't know as I just found the wastegate actuator on mine is shot and was wired shut so it would boost. I have no Idea of the specs on these trucks. My truck the way it was would pull up to 13 psi normally on the highway depending on hills and normally driving anywheres from 5-11psi. If i stomped it I would pull well over 15Psi as the little boost gauge thats installed that is a 15psi gauge will go past and start going around again. I got a lot of questions, but need to start getting some answers for at least a baseline, maybe this thing is out of wack thats why my MPG sucks.
Parrish206
12-27-2006, 15:04
My MPG averages 14.8
_________________________
95 3500 ext cab,K&N air filter
no other mods
I have a 93 GMC 6.5 Turbo Diesel with a 5 speed manual transmission and I use the criuse control. This is an extended cab pick up approaching 70K miles.
This is my first diesel vehicle and I am learning the ropes and I really like driving this truck. I live in Montana and it makes going from point A to point B quite pleasant since these points can be very far apart.
On a recent trip to Minnesota in January, I average 24 mpg. I did have a tail wind that helped and I was traveling light. I normally average better than 20 mph.
I check my mileage at every fill up, so my mileage records have a good track history. I will see in better detail how things shape up when it warms up. So far winter weather has not slowed me down too much.
I enjoy this website and bulletin board. Keep up the good work; all the best.
GMC-RKL
I had original rubber on my truck when I received it. The tires quickly played out as I started driving it over Montana gravel roads.
I replaced the old tires with Cooper 235/85 R16 10 ply. They are taller tires. Over 100 measured miles the odometer is reading about 95 miles traveled. I would imagine I am rolling faster than my speedometer indicates as well. But in Montana the Interstate speed limit is 75 mph. I ususally do not go that fast.
So, if I could have an accurate measure of miles traveled I might be getting even better mileage than I calculate.
My truck runs like a dream at 1800 rpm in 5th gear going about 65 mph, and I fit comfortably in it to boot. Happy driving.
RKL
93 MECHANICAL ext cab long bos 5sp 4x4. Put on the cold air intake, 3in down pipe and 4in exhaust and get 18.5mpg. Have 4:10's
dawghauler
04-15-2007, 09:55
19 to 21 given the following makeup and variables at approx. 70mph
Stock 6.5, 4L80-E, 4.10 gears, Stock size tire
1. 1996 Chevy Suburban
2. 2500 2wd
3. Fuel Additive: PSP @ .45 oz/gal
4. Condition of vehicle: Fair
5. Driving habits: Conservative
6. Thermostat: 195
7. Overall rear gearing: 4.10
8. Stock Air Filter
9. Intercooler: None
10. ECM Boost Control
11. Stock PCM
12. Exhaust: stock
True Americans - Patiently waiting for the poison shrub to burn out.
hayhauler69
05-19-2007, 07:44
I'm getting about the same mileage,
100000 miles on truck
1995 4x4, K2500
Stock with a FSD cooler
and straight through 3" exhaust.
I plan on putting a 40 horse chip in and am wondering what that'll do to my mileage. Also will be installing after market intake filter (cone style) I want to hear the turbo whine.
Right now I get 18/20 MPG at 1900 RPM which is about 61MPH.
Anything over 2000RPM and the gauge drops proportionally.
What I don't understand is how can a person with a lifted new 4x4, oh let's say a Ford F350 Crew cab just for kicks with a diesel can haul down the freeway at 80MPH and not be in the poor house. I see it all the time.
I've got a good job make good money, these guys must be running the credit up at the gas station.
Well, I get about 9.8 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.
Things do change - with my replacement Peninsular Diesel AMG 230 HP (custom spec'ed) 6.5L TD, mileage is nearly 11 mpg...
moondoggie
06-07-2007, 07:02
Good Day!
I hope you're not unaware of it, but going from 9.8 mpg to 10.8 saves you ~ 1 gallon per 100 miles. Do the math: at today's fuel prices, that's a significant savings.
Blessings!
dually0185
06-12-2007, 16:32
18 MPG. That's not bad for a tank.
sjgarcia
07-03-2007, 19:54
Freeway: 13 to 14 mpg cruising at 75 mph.
City: 12 to 13 I think my dear wife likes to hear the diesel roar as she leaves the stops. :-)
4.10 rear end
Automatic trans.
Steve
I have a 94 with 152,000 miles on it with no motor work. The truck is an ext. cab long bed, 3/4 ton with 3.73 gears. Everything is stock except a Heath Diesel lift pump. On freeway I get an average of 22 mpg and in town/highway i get an average of 17-19 mpg.
urcableguy
10-06-2007, 21:49
To "dually0815".........Youre truck looks awesme,was wondering if i could get a few pics emailed?Just purchased exact truck and would like to do the exact lift and size tires..Good Looking Truck!!! Thanks, urcableguy@hotmail.com
bassbone63
10-17-2007, 17:47
1997 Suburban
1500 1/2 Ton (snicker snicker)
6.5L factory engine NO mods
3.42 gears
42 gallon tank
150,000 miles
highway 24mpg @ 65mph
city 15 - 18mpg depending on season
Not bad for something that weighs as much as a semi
gets 16-18, doesnt matter if it is in the city, on the highway, pulling, towning, loaded, i hauled a 450 gallon water tank all summer, avg. 16.4, 4.10 gears, but I only drive the truck 63 mph, on the freeway i go 70.
acfloors
12-21-2007, 07:58
I have a 2000 express 1 ton van with the 6.5L totally stock but for the K&N air filter. My best mileage to date was out west in nevada. I got just over 20 miles per gallon. I average 17 to 19 depending on if I run the cruise and keep it at or below 70mph.
My 95 3500 DaHooooley crew cab 4x4 with 6.5 and 4.10 gears will run 18-19 at 60-65 running light
Robyn
My numbers are like this:
1999 C2500 Suburban, 6.5TD with no engine mods of any kind, 3.42 rear in place of 4.10, 4l80e with no mods (but a deep cast aluminum pan), 23585R16E tires (Uniroyal Laredo cross country) at 65psi on stock steel wheels (245's are too small in diameter and too wide), 150,000 miles on odometer.
City 17.3 worst; 18.1 best (Houston area traffic)
Hwy 21.2 worst; 22.3 best (Texas Hill country to Flat Gulf Coast Interstate)
Keys I've found to mileage:
In the city: Gentle acceleration; as best you can, plan how you're going to make your stops in traffic (don't tailgate so you don't have to slam on the brakes).
On the highway: Cruise control at 65mph on the highway (about 1775 RPM on my rig).
Mighty happy with this from a land yacht:-)
I'm going to pickup my new truck in dallas tx. here in a few weeks i'm driveing it home to frostburg md. its about 2000 mile drive it's a bonestock 1995 2500 ext.cab longbed 4x2 new motor exhast and tires i will post my results as soon as posible
i got it home it didnt do bad the truck sat for 6 years with a blowed moter it had 83 miles on the new moter when i left tx. lift pump didnt work and the wastegate didnt work right still did prettygood on fuel
7thdaypope
06-27-2010, 22:11
This is a great post from some real folks driving real trucks for real miles.
I am interested to know from those of you who have 3:42's under your rig if you have issues with lack of power especially while towing. :confused:
The gearing is great for mileage as we can clearly see from the posts, but can you pull a trailer up a hill without leaning forward in your seat?! :eek:
I'm deciding how to get the RPM's down under 2,000 on the highway, whether to change the gearing, or go to taller tires, or a combination of both.
Give me your input, what you have done, what you have seen or heard.
I am interested to know from those of you who have 3:42's under your rig if you have issues with lack of power especially while towing.
I had a standard in mine and pulled a 2 horse trailer, about 5000 lbs. You had to work the gears a lot. It would have been better with an auto, although I doubt the mileage would have been as good. We saw 17+ mpg towing on reasonably level ground.
If I had been any heavier, I would have stuck with the 3.73 gears.
I only have ~1,000 miles on it, but the Suncoast tranny rebuild, and its TC and input shaft, have apparently increased fuel economy from 10.5 to ~11.5 mpg.
This is a great post from some real folks driving real trucks for real miles.
I am interested to know from those of you who have 3:42's under your rig if you have issues with lack of power especially while towing. :confused:
The gearing is great for mileage as we can clearly see from the posts, but can you pull a trailer up a hill without leaning forward in your seat?! :eek:
I'm deciding how to get the RPM's down under 2,000 on the highway, whether to change the gearing, or go to taller tires, or a combination of both.
Give me your input, what you have done, what you have seen or heard.
My 1982 Suburban non turbocharged 6.2 has a 3:08 rear end and I tow a 26 ft airstream weighing close to 6k lbs. I'm using 30x9.50 15" tires. I tow in direct drive (3rd gear) and at 60 mph, the engine turns over at around 1900 rpms. It'll pull the smaller hills in direct drive but on steeper hills such as a 5% grade, once the speed goes under 45 mph, I shift to 2nd gear and then the engine puts out good power. I can pull as fast as 60 mph (3500 rpm) in 2nd gear if needed. I did some calculations and 3.08 gears with 15 in tires in direct drive is similar to 3.73's and 16 in tires in overdrive. Also, most transmission are the most efficient and can withstand the most torque while in direct drive.
I only have ~1,000 miles on it, but the Suncoast tranny rebuild, and its TC and input shaft, have apparently increased fuel economy from 10.5 to ~11.5 mpg.
Now with 3K+ miles, about 800 in the mountains, mileage is ~11.7 mpg
turbonator
08-12-2010, 16:21
Our 6.5L in the ''Pugg'' is getting just under 14mpg......(C-5000 truck)...LOL.:D;):cool:
This is a great post from some real folks driving real trucks for real miles.
I am interested to know from those of you who have 3:42's under your rig if you have issues with lack of power especially while towing. :confused:
The gearing is great for mileage as we can clearly see from the posts, but can you pull a trailer up a hill without leaning forward in your seat?! :eek:
I'm deciding how to get the RPM's down under 2,000 on the highway, whether to change the gearing, or go to taller tires, or a combination of both.
Give me your input, what you have done, what you have seen or heard.
I don't tow heavy very much but I did last weekend. It was all flat roads in south Louisiana towing a fully-loaded 6 X 12 U-Haul plus rooftop carrier plus a cabin full of people, probably around 5K lbs or so. The vehicle ran well and we had to cross a couple of large bridges over the Mississippi and Atchafalaya rivers. I was able to maintain 55 mph with about 65% engine load showing on my Garmin EcoRoute and about 185 degrees intake temperature going uphill (that's about all that will show on this setup). I don't have a gauge pod installed yet. If I were towing heavy loads all the time I'd want 3:73's, but the mileage with the tall tires and 3:42's running free is around 22-23 at 65 mph and that is how I usually travel. I also installed a set of rear disc brakes since my last post. They definitely stop a lot better. I didn't notice any change in the highway mileage but I did gain about 1 to 1-1/2 mpg in town, due to the lighter weight, I suspect. All-in-all we now have about 175,000 miles on our Sub and we absolutely love it.
A few weeks ago I made a trip out to San Angelo with it (no trailer) and ran 70-75 mph the whole way. I got about 19 mpg in the Texas Hill country at that speed and was never lacking for any passing power.
Captain Jojo
01-31-2011, 00:55
Hello,
Am getting 16 mpg at 63mph empty, with a 6.5 TD and 3.73 gearing in the back, 4L80e transmission and cutaway van with box (1 1/2 feet above cabin).
Got a couple of questions since I want to trim it to get as best of mpg on the highway at 65 mph as possible. Will not tow and run this van almost empty (will convert it to a RV):
Does anybody have experience at what rpm the engine runs with the 3.03 gearing of the rear axle instead of the 3.42, and if it still drives ok (not too sluggish)? What is the thinnest tire with the same outside diameter on this rig? I heard somebody using (harder) military tires for less rolling resistance and am wondering if that would be an option to consider. Am working on getting a wind diverter, too. What else can I do (IP is in good order)?
Thanks a bunch up-front. Am new to this croud here and must say that the abundance of info is overwhelming.
J
I had 3.42 gears in my '93 and would not recommend going any higher than that unless you're putting it in a Corvette or something else really light.
Captain Jojo
01-31-2011, 11:56
Well,
It is a express 3500 van with 5,500 pounds in weight, not necessarily the same category as a Crovette. However, I am not out to win acceleration contests but get good fuel mileage. Would the tranny suffer from such gearing? I am just trying to find out if the higher gearing to 3.43, such as 3.03, would be doable with a compromise in acceleration of it is just not practicable. Was wondering to mayby do 3.43 and experiment around with larger diameter tires...
Pick a speed, say 65 mph. Now, pick a gear ratio and tire size that puts you between 1800 and 2000 RPM. I think you'll find that 3.42 is going to be close to optimal unless you are grossing 10K or more. 3.03 is going to put you below the most efficient range, lugging if you will.
Captain Jojo
01-31-2011, 23:12
Hey JohnC,
Am reading and learning. Thanks for your patience, am somewhat only getting started really getting to know cars and diesels in particular.
3.03 is going to put the engine below its torque peak, understood. I guess my question is still: what rpm would I land up with and how sluggish would that be? Still drivable in everyday driving conditions but just a bit slower acceleration, or almost no acceleration at 65? The fuel economy should be better below torque peak at 65, wouldn't it?
I assume you are saying that the gains in MPG would be too small to justify the compromise in acceleration? Or do I loose mpg because the overdrive wouldn't lock?
Thanks a bunch for your help, I appreciate it.
J
My 99 Suburban, 4.10 gears, 115K with marine injectors.
Was getting 15 mpg with 245/75R16's.
Now getting 18 mpg with 285/75R16's. They just barely fit, but it sits nice and the BFG A/T rubber looks mean.
Both fuel mileage indications taken from my regular commute. 13 miles one way, till I hit 1/4 tank. 42 gallon tank. 55 mph speed limit, with the cruise set to 57-58 per GPS since the speedo is now off. 2K RPMS for 55 sucked with the little tires.
1 year update on the fuel economy for my Suburban: This is an aggregate average of a full year's worth of driving and fuel use. Since the conversion was completed, it has traveled 18,485 miles, consumed 740.258 Gallons of fuel, and averaged 24.971 MPG. This is overall MPG, with around town and highway. Best tank 28.1 MPG. Worst tank 17.7 MPG. I am very satisfied.
:
Originally Posted by rustyk
Well, I get about 9.3 mpg, but then my 6.5L TD is in an 18,000 lb. class A motorhome.
Things do change - with my replacement Peninsular Diesel AMG 230 HP (custom spec'ed) 6.5L TD, mileage is nearly 11 mpg...
Do a little here, do a little there...with the Suncoast HD tranny and TC, redoing the diffy (Someone had been in there previously and the pinion bearing clearance was way tight), and fixing a stuck caliper, consumption is now averaging 12.2 mpg over the last 5K miles.
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