I was going to post a question about my deteriorating fuel mileage but decided to jump in here and see if anyone can help. I have a 2002 2500HD Dmax (not sure what model engine that makes it) that I purchased used here in Canada with 130,000 Km. When I first got the truck I was consistantly getting around 23 to 24 MPG (Imperial) around town (some hiway, some town) and while towing the 5th wheel would get anywhere from 15 to 18 MPG depending on terrain etc. I was quite happy with those figures! I now have 144,000 Kms ot the clock and lately my around town MPG have been dropping steadily, first to about 21 and this week to 18 MPG. I convert my mileage with a calculator using the Kms travelled since previous fill up and # of litres to fill the tank. I don't think my driving has changed (not aggressive on the throttle), the truck seems to still run well, doesn't smoke that I can tell, so what's up! Any ideas what is causing the drop? As always I appreciate the comments and help.
Cheers,
Bruce
Vancouver, BC