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bigger tires make for lower revs at actual MPH, make sure to adjust 1 you speed acordingly and 2 when you calculate tyou MPG adjust for the added tire size...
keep them narrow as stock or narrower, wider makes more rolling resistance.. this is where trucks get MPG drops they usually go from a 8" wide tire up to a 10" or 12" wide tire.. thats where they get nailed.. and many don't think about the added diameter and just go by there odometer..
some of there trucks tires are 20% bigger than stock se for ever mile your odometer says you went you actually went 1.2 miles.
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