I have 265/70 16s(on alu) on in the summer and the winter is 275/70 16s on steel so they are quite a bit heavier which doesn't help. I know that I have some error with the 275s but its minimal(like .5mpg off) my elevation is 2500ft or so. When I was back home in MI at sea level I got about the same.


1997 T-100 100k and counting Green
5spd 4x4 Ext Cab isr mod Aisin Manual hubs