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With oem tires it will always downshift on anything more than a slight incline however will pull most hills in the downshifted 5th gear and mpg does not suffer much. If I go bigger I wonder if it will still hold 5th gear or dowshift to 4th due to gearing change from taller tire plus heavier tire of 4-6lbs/tire. On a few hills when it drops to 4th mpg goes to the mid teens vs mid to low 20's in 5th. Per tire rack oem tire is 15lbs and all other tires I have looked at same size or larger are in the 19-21 lb range. Also wonder if taller heavier tire will make up loss of the up hill with the flat and down hill parts of commute? Also will taller tire affect suspension/rubbing if hitting a bump or hole in the road. I know I have one inch clearance from side of tire to anything it would hit while turning so could run a tire almost 2" wider but do not know how much up travel clearance I have. Maybe 2-3" from top of tire to fender normal stance on level ground.
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