jbrady1965 Posted December 31, 2009 Share Posted December 31, 2009 I was driving my mom's camry over the holiday's and noticed at 85 mph her rpm was 2700. In my IS 300 while my rpm is 2700 I might be going 60 - 65 mph. Is there any way to change the ratio in 5th gear to provide better fuel economy while driving over 80 as I often do? Quote Link to comment Share on other sites More sharing options...
bartkat Posted January 1, 2010 Share Posted January 1, 2010 I guess you could change the differential gears, but you'd lose performance in all gears. I don't think just trying to change 5th would be doable. I'm not sure but the rear end gears for the manual trans may be a different ratio than the auto. Quote Link to comment Share on other sites More sharing options...
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