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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 rims. Thanks
 

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Anytime you go up in size you will drop your fuel mileage a bit. I went from 245s to 285 and they look a lot better, kinda wish i would have gone with 265s to get a bit more mileage.
 

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Oh...... Squirrel!
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also, you speedo should be correct with the 265s without any programming. It seems that most trucks show faster than you are really going with the 245s....at least mine did.
 
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