Terrible mileage

[thz71]

MAYBE 1 or 2 mpg imo

 

[tanman_2006]

For the work involved you need to put alot of miles on your truck to see the benefit.

 

[great white]

I don't need it for towing really at all. I'll haul a few ATV's (3-4, 700lbs average each) a few times a year, and twice a year I'll probably put a camper on and drive a few hours to the lake for some camping. That's it. I'm not hauling a fifth wheel, car trailer or horses. I don't need the 4.10's as much as I need the milage.

Any idea what sort of mpg gains a person would see switching from 4.10's to 3.73's?

Couple mpg or so.

3,42's are a bit better, but are mainly used on 1500's that are used like commuters vice trucks.

 

[east302]

Works out to 16.48 US gal for 167.46 miles or I believe 10.39 mpg.

Are you running the stock tire size?

If not, consider odometer error in your mileage calculation:

http://www.performanceprobe.com/ind...nceprobe.com/misc/index.php?do=calc&page=tire

Making sure that it's in top mechanical condition (catalytic converters aren't bad, for example) would probably be worth looking at before swapping gears.