Mike,
I've got 255/85s and I've kept records of every drop of fuel consumed. I saw approx. 1mpg increase in mileage numbers all else being equal.
I used to cruise at an indicated 75-80mph which IIRC was about 2300-2500rpm. Now I drive at the same speed but rpm is about 2100-2200.
With the 255/85s and the Juice, you could tow all day at 65-70mph (~1900-2000rpm) and stay in 5th gear the whole time if you drive smoothly.
That is the ideal setup to me. The tires fill up the wheel wells a little better, get the rpms down a little (9%) and the Juice gives you all the torque your tranny can handle to keep you going as fast as you want (or is safe!) The rolling resistance should be minimally affected and the Dunlop Radial Rover A/Ts (which I copied from a lot of other people on t his forum) ride really smooth, they take out a lot of the little jiggles even at 60-65psi. Thye're a good value, too at about $105 ea. I've got about 7,000mi on em so far and no noticeable wear. I bought a spare OEM alloy and mounted a 5th 255/85 for the spare, which will allow me to rotate 5 tires.
I've got a theory that ford2chevy is getting lower mileage due to his right foot... anybody stacking the Juice and Van Aaken box isn't doing it for economy reasons. You gotta admit, the economy numbers are pretty darn good when you consider the weight of the truck and how much power you're puttin' down from stoplight to stoplight (after the tire smoke clears .)
Regards, Steve
\'02 2500HD 2WD LS, grey, CC, SB, D/A, locking diff., alloys, trailer and towing pkg. Delivered 11/09/01<br />So far:<br />Juice ver 3.61c, Max Power Plug, PS2000 propane, Gibson Performance dual exhaust, 255/85-16 Dunlop Rover A/Ts<br />Pillar mounted SPA Boost/EGT/oil press./oil, tranny, diff. temp gauges, Valentine One<br />Aiwa CD/MP3 head, 4- Pioneer TS-C1653 6.5\" component spkrs, 2-10\" Tsunami subs, 1200W of Visonik amps<br />Jordan 2020 Ultima Brake Controller, Lucerix mirrors, Line-X, Bed X-tender, DeeZee running boards<br />Peragon folding bed cover, Rancho RS9000 shocks<br />PIAA headlights, Power tailgate lock, Invinca-shield, Husky flaps and tinted windows <br />Mag-Hytech diff. cover, Allison deep sump, Transynd, Amsoil air filter and gear lube, Fumoto valve<p>Up next:<br />high idle, Spare fuel tank?<br /><a href=\"http://www.pbase.com/sfrakes/2002_silverado\" target=\"_blank\">Truck Pictures</a>