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Message: <blockquote data-quote="castine917" data-source="post: 839631" data-attributes="member: 11473">using $3.50 per gallon for an easy to figure average fuel cost and 4.10/373=1.099 means around an 10% fuel difference. not sure of your mpg so i will just use 15 as a guess for current. switching to 3.73s would move you to 16.5 mpg. 300 mile trip with 4.10s=20 gallons=$70 300 mile trip with 3.73s=18.19 gallons=$63.64    that is $6.36 for every 300 miles. to save $500 to pay for the gear change will take 78 trips of 300 miles or 23584 miles.  gear swap for mpg seems a mute point to me. granted that gear ratio change will change driving habits affecting mpg also but could take mpg to worse also. i have seen some get better mpg with the steeper gear because of driving habit changes and other factors of powerband manipulation.now, to keep in powerband and cross finish line at certain rpm and gear makes all the sense in the world to me. :laughing4:</blockquote>