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 ...
Go for it. It would be a greater impact to change to 75 series and stay at 265. Depending on the actual tire manufacturer the differences may be greater or less than the numerical comparisons tell you. The wind will have a greater difference on your fuel economy.