What would the pros and cons be to changing my tire size on my 2013 GMC 2500HD diesel from an LT265/70R18 to an LT275/70R18? I'm looking at doing this due to cost only. I can get a very good price on ...
New tread or aggressive tread will have more of an effect on mpg than the slight increase in diameter. Depending on the vehicle, changing tire diameter could overall increase or decrease mpg a little. If it fits, which I'm sure it will, here are no detrimental effects of running a slightly larger tire.