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275/60/17's are 31.1" vs 255's 30". This should give you a 2115 rpm at 70.This is not a lot of difference but the load range goes down 50-70lbs on 2100 lbs per tire. Nothing to worry about unless you are going to use max loads in your truck.My guess is you will lose some mpg which could be restored by driving 65 mph.Hope this makes sense? Roy B
Last edited by royanddoreen; 09-05-2012 at 09:15 PM..
Reason: correction
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