Chevy and GMC Duramax Diesel Forum banner

tire mpg

  1. Tire Size MPG

    2007.5 + (GMT 900) Non Powertrain New Body Style
    I have a 2007.5 crew cab long bed 2WD 6.6 with the Allison 6 speed. The truck came with the small 245/75/16 tires. I want to put a little bigger tires on when these wear out. Is the truck set up to run this size for the best mpg or can I go a little bigger and not hurt mpg? I plan on keeping the...
  2. mpg 245/75/16

    Wheels & Tires
    I have a 2007.5 crew cab long bed 2WD 6.6 with the Allison 6 speed. The truck came with the small 245/75/16 tires. I want to put a little bigger tires on when these wear out. Is the truck set up to run this size for the best mpg or can I go a little bigger and not hurt mpg? I plan on keeping the...
Top