since i converted my duelly to a 4 wheel truck ,my mileage went from around 16 mpg to around 20 mpg

 

I'm getting almost 25-27mpg on a long drive but i measure in imperial galls not US galls

 

same truck at tenbrooks. I get 19 anytime unloaded up to about 65 mph then it goes down hill. Interestingly I just moved to MN and the truck is now at 20 anytime and get 21.5 more often than not. (unloaded) i've gone back to TN twice now and got 19 there and 20 + here must be the diesel fuel blend. It definitely smokes more up here. Like about 10 times more.

 

Since I put on my 19.5" tires/rims, I have lost mileage -- dropped down to ~16.5 at 60 mph. I was asked if I am using the trip computer: yes. I am not sure if the speedo is correct now or not. It seems a lot closer to actual than when I was running the incorrect 225/75R16's, just based off of regular traffic flow.

 

After reading through this post I must say that I am quite jealous of just about all of you! I get 9.5 to 10 MPG whether its unloaded in town or cruising pulling an 8000# trailer in my 99, quad, auto, w/ 3.55. I recently purchased a Superchip which did give me more HP and torque, but no better fuel economy. I have 51,000 miles so it should be better than that I would think. Obviously I have problems to tend too!

I better start reading more

 

empty the best i have seen is 16.8. on adverage i see 14.5 hauling a 4,000lb trailor but can get as low as 12.8 hauling the same load on a friday

 

Got a 2500, 5spd, 3.54 I get 19-21 MPG

 

I'm getting 17 or so around town and 19 to and from work (combination highway and city).....I'm happy with that.