I didn't believe it either , why I did the math a handfull of times just because I figured there was no way that was right. Now I left out that was straight interstate riding from the UP to Rockford Illinois and then back. I don't keep track around town or on my daily travels as I honestly don't care about those numbers. As for the power issue, I could hardly pass a car going uphill with the stock tires on it (265/75r16 roughly a 31x10.50) untill I pulled my throttle plate and ground off the aluminum "baffle" on it, removes the vortec box at the same time so idk which made the difference but man did it make a HUGE difference. I stand by my highway claim of 22 mpg tho, a buddy of mine has a standard can long box with 3:42 on 305s ( 33s) and claims 21-22mpg. We don't really have anything but long open roads here with 55+ mph speed limits, not alot of "town" driving so that may help the mileage numbers some. I got two sets of rims so I'll put the 37s on and see what it feels like and if it's a dog they will come off and wait till I get sum gears for it. The option of SAS is there to but all I really have access to is 3/4 and 1 ton axles and damn sure don't think that'd be good daily driver setup.