OEM tire for this truck was General LT225/75R/17. Got 45k miles on first set, and just over 50k on second set. When I went to purchase a new set, learned that OEM tire no longer available. Also learned that the LT225/75R/17 not made by most major tire makers. Only Firestone offering this size, but the Firestone tire was not rated favorably in all the reviews I could find. General Tire recommended that I use LT235/80R/17 as an alternative size. This size tire has about a 5% larger diameter than the OEM size tire, meaning that my speedometer would read about 5% less than my actual speed. Does this mean that my odometer would measure 5% fewer miles? (e.g., for each mile recorded on the odometer, would I have actually traveled 1.05 miles?) What would be the impact on the DIC info on mpg, range, and gallons used, if any? Will appreciate any feedback on this issue. Thanks.