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I own an electric car and investigated the cost of using a gasoline powered small generator to recharge it. I was surprised to find that depending on the generator, a U.S. gallon of gas in the generator was roughly equivalent to an extra 25 miles in the electric car, similar to what an internal combustion car would get.
In my opinion a worthwhile accessory to have in case of emergencies.
similar, only because your comparing to a plain gas car. a gas hybrid car should be well over 25mpg. obviously an electric car benefits from said hybrid efficiencies.
but sure, apocolypse scenario, its an option. The rub is how much fuel you can store for it, and how you manage to keep it cycling if you dont have a gas car with which to periodicly consume it.
My generator holds 2.5 gallons, it'll last 8 hours when full. So let's say we run it all, I should get like 50 miles in 8 hours off of that 2.5 gallons. Or I could put the fuel directly into my gas engine car and drive about 70 miles. Granted it all depends on your specific engines all around.
Ehhh.... 25 MPG really isnt good on anything made in the last decade. I mean, for comparison, my wife's old 2014 Passat got upwards of 32 MPG, and my 2013 Prius hybrid gets 48 miles to a gallon of gas.
Also, if youre going with an electric car due to environmental concerns, you should be aware that a generator like that is goping to not only get you less miles per gallon, but will also produce more pollution per gallon than a car would.
For emergencies, sure, but as a way to get "extra miles" out of an electric car, not so much.