If I buy a 2500 with the G56 (4wd QC of course) and I do alot of hwy travel at usually 75 mph, what kind of mileage can I expect. Now if I put bigger tires on will that help or hurt on the hwy. I know that it will lower the findal drive ratio, but will it hurt the mileage? Not trying to beat a dead horse.

Thanks
Jason

 

When I drive 75 I get 15-16. If I slow down to 65 I get around 18-19. Some claim better but that's what I get. Overhead says at least 2 mpg more but it ain't happening. Sometimes at 65 the overhead will even show 23, wish that was true.

 

It would be a safe bet to say you are going to get in the ballpark range of 12-17MPG.

Merrick

 

i would agree w/ jdeere except my overhead seems accurate 16-19 depending on how i drive on stock rubber.........need an auto guy to chime in and be honest about things!

 

Thanks for the replies. It seems that is varies alot as most depending on speed.