Mudsling

Man that's what I was thinking. It shouldn't be that big of a difference. I just got my truck back from dealership and told them to look at the drop in mileage. They told me it had to be the rims and tires. Said they prolly weighed 80lbs combined. I had the exact same truck (with stock 18's) for a rental while they were working on it and it got high 19mpg. Who knows ha

Actually its a noticable difference. Going from 19-20 mpg to 15-16 mpg is pretty big

from my understanding they are a stock GMC rim and can get at dealership. also seen them online. ive noticed some trucks having them. they are 20's but kinda wished i had the 18's for better gas mileage.

yes sir. they actually came with the truck when i bought it

boom