I just purchased a 2005 6 speed 2wd quad cab with 120K and 3:73 rear axle. It has some high end Michelin A/S tires. The top console said it was averaging 22.6 mpg. I have no idea when the last time it was reset or if it even accurate. I ran a 1/4 tank thru it and filled it up and reset the display to Zero. I have not towed with it yet and drive conservativly in town (between 1000 - 1600 rpm) and at 75 the rpm is ~2150. The console says I am averaging 26.6 mpg. Since I haven't ran a full tank thru it I have yet to do the math - but I am curious - is that kind of mpg legitimate or is my overhead on 2005 2wd 6 speed or is my console living a dream?

 

I have seen some that were close and I have seen some that was way off. The 05, 3500, 4x4 w/3.73's will tell me that i'm averaging 24-26 then when I fill up and calculate by hand it was really 16-17. The 05, 2500, 4x4 w/3.55's was better and when empty I could get 22-24, calculated by hand. The 2500 seemed that the more miles on the odometer, the better the fuel mileage was. We traded it off with just over 310,000 miles on it and was getting close to the 26 mpg mark.

 

The best my 2005 2wd auto ever got was 22.5mpg at 65mph. 21.5mpg at 70mph and 20.5mpg at 75mph. It also got 20.5mpg at 55 mph.




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the overheard is notorious for not being accurate.. Hand calculate your mileage if you want the truth.. mine averages about 16mpg in mixed driving

 

I also suspect hand calc will be considerably lower. 2wd with 3.73 and stick I think may get mid 20's, if it was all highway at 55-60 mph.

 

My truck with smarty set on 3 with timing, cruse set on 65
tires on max pressure got me 24.6 hand calculated.

 

Years ago I hit 24.5mpg while keeping the speeds below 65mph. I wouldn't doubt 26mpg if keeping the speeds at 55mph.

Don't trust the Lie-O-Meter, always hand calculate.