My truck has 15,500 miles on it ... I just go the best mileage yet. Coming back from the Thanksgiving weekend is the first day my truck has seen below 60 degrees. It has been over 80. Coming back it was in the high 30's to low 40's.

I've made the trip home (550 miles r/t) numerous times and the best I get was 17-18. Going up, I got my normal 17-18mpg. This time coming back I got over 20 mpg.

Can this be related to the air temperature/air density?

 

19.5 to 19.75 no load 50mph average mostly back roads. bone stock auto with 3:73's. no fancy additives or other crap i dont really believe in (hey I'm entitled to my opinion). lots of coasting to the stop signs.

Stephen

 

21 mpg on trips to rapid city, 130 miles one way, around 18 running around close to home, 1997 3500, #6 fuel plate, bhaf, 4 inch bullydog system, blocked wastegate, auto trans 3.55 gears 225-75-16 tires

 

22.6 Flat highway @ 70 MPH empty (Modesto to Bakersfield).
22.3 @ 70 MPH (Bakersfield to Barstow to Modesto with city driving in Barstow)
Hand Calculated.

2006 5.9, 2 WD, Auto, 3.73 gears, Stock

 

your a lucky man!!

 

12 mpg or less if I have on my heavy boots
4x4, oversize mud tires, auto trans, Mopar Performance, 3:83 gear, and 250,000 miles

22 mpg in town gets up to 26 on the highway
mostly stock except for some Banks stuff, 2 wheel drive, 3:73 gear

 

Drew, 2007 Mega Cab 3500 4X4 SRW Auto w/3.73 fuel calculated by hand 18.1 and 19.7 by the computer running 65-70 from Yuma to Malibu and back so mostly around sea level.

 

22.6 hand calculated going 70 mph from Modesto to Bakersfield, CA. 22.3 from Bakersfield to Barstow, some in town driving and back to Modesto. Kept highway speed at 70 max.

 

When my truck had less than 5k miles on it, I pulled an 6000lb trailer from Fairbanks, AKto Illinois, then to California. I averaged 13.0, with around13.5 in the mountains and12.5 in the flatlands. I guess this was due to running 75-80 out on the open highway. Right now, with 85k miles, I get 21 (hand calculated), with mostly highway driving.

Answers to Poll
1) Stock with K&N FIPK
2) No additives
3) NV5600 6 spd. man.
4) 4.10
5) 4wd

 

Currently with 2,800 mile on the truck, the best highway mileage at 75 mph is 17 mpg and the worst in city driving is 12 mpg. All hand calculated. The truck is stock and full of CA emissions. I hope that when this puppy is broken in the mileage will increase. Plan to buy a fifth wheel this spring and will check back with mpg under a load.

2007, 2500 Mega Cab, 4X4
6.7 CTD, 6 speed auto, 410 rear end