Check out fuelly to see what owners are getting in their cars. Beware of counting the average as realistic, there are always a few whose gas log ruins the averages. Then look at ecomodder's garage to see what is possible, but understand that one thing you don't know is average speed. You might consider a members fuel log as unbelievable, but if their average speed is half of mine at 40 MPH then aero drag is reduced by the square root as a good comparison of watt hours per mile.
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regards Mech