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There are several ways and several considerations.
First, the energy drawn from the wall is more than the energy supplied by the battery because charging is not 100% efficient. Charging efficiency is normally in the 77-90% range.
Some people take the number of miles driven and divide by the number of kWh consumed. This would give miles per killowatt hours. A rough average of EV drivers is 4 miles per kWh.
You could just as easily take the kwh consumed and divide by miles, which would give you watt hours per mile (lower is better).
You'll want to do A-B-A testing with your mods to verify the results reflect real differences in the mod rather than some unaccounted for variable like wind direction, temperature, etc.
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