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you also have to have a 240V power feed. It takes 4 hours to replace the gas you'd use to drive 50 miles
That sounds like a nice way to lessen one's carbon footprint.
Somehow, compressing natural gas to whatever pressure it is using in the car, especially compression that requires 240V power, gives me more than a little uneasiness. Have you ever seen a bottled gas tank careen around someplace after the neck gets broken off. Two major problems with this setup, IMHO. First, the tank must be extremely safe which means heavy which means dead weight in the vehicle. Second, the pressurized gas can be very dangerous should the tank suffer even a tiny leak. If it doesn't, literally, propel the car in some random direction, it will be an ideal blow torch looking for any spark!
But I'm sure we can trust Detroit to take care of all those little nuisances before selling them to us...