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X3 that the 2.73 gears would be too tall. Get instruments first to see what you are getting at what rpm. I know 50mph at x-rpm is different than 60mph at same rpm but it might give you an indication of where the mpg drops off from the engine running too low...
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-Mike
2007 Ford Focus ZX5 - 91k - SGII, pending upper and lower grill bocks - auto trans 
1987 Monte Carlo SS - 5.3/4L80E swap - 13.67 @ 106
2007 Ford Focus Estate - 230k - 33mpg - Retired 4/2018
1995 Saturn SL2 - 256K miles - 44mpg - Retired 9/2014
Cost to Operate Spreadsheet for "The New Focus"
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