CM871 fuel mileage

[superbudy208]

Ok I thought so, I try to cruise around 68 to 70 @ about 1450 rpms, the truck has a eaton ultra shift 10 speed auto, with 3.36 rears and 22.5 tires, I try not to lug it, it runs the hills well at high rpms, I have a 53 ft flat bed and have been to hauling a lot of vinyl fence that is pretty square and most of the time it shifts around 1500 rpms and will down shift around 1200, I don't really go over 1500 very often it don't seems to like running that high rpms, I've tried running 63, 64, and found the mileage was the worst its been