oops, did a false post. I added 285/75 tires and notice my mileage fall almost immediatly by about 1-2 mpg.
Originally posted by MPH:
I too have been a little dissapointed in the lly's mileage. driving home from the dealer it averaged 18.4, which I was impressed with, but it has never been that high since. Pulling a little two place snowmobile trailer, i was only seeing about 11 mpg. I put 305's on it right when i got it home. could this have affected it that much? It didn't seem to drop the LB7 that far.
2004 GMC Duramax Crew 4x4 HD 285/75/16