Your Mileage May Vary... - EVTV Motor Verks
This points out that watt-hours/mile depends on the state of charge of the battery pack, IOW the first mile comes easier than the last one.
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And so we came up with a rule of thumb. And that rule, based on just our own outcomes, was that for every 10 lbs of car, it will require 1 Watt hour of energy to cover 1 mile of travel.
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Would you believe that Tesla Model S did VERY well on this at 12.22:1? While the SmartforTwoED, which we have found their corporate management none to Smart, is predictably enough down around 6.5.
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Here's their chart:
