think the 40's would be too big? those are 38's on it right now Are you even getting 12mpg? Just wondering. average 10.7MPG. thats another reason i'm going to do the Duramax diesel conversion, the extra power will be nice also. Will 10k even touch putting a Duramax in it? not likelly. it's quite a bit more than that, but i do get one more bonus from work that i'll be using since i quit being a boss. That won't be till the first quarter of next year though Don't waste your money, you work too hard for it. i do bust my ass now. you are right about that