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All they're doing is cutting the gas tank in half. For most people's daily commute, they will never exceed the range provided by the battery. In that case, the gas in the tank would probably go bad before they even used it.
It is no less efficient! Instead of putting X amount of gallons in the tank one time, you put X/2 gallons twice. Not a big deal (to me at least) if I'm not exceeding the battery's range on a daily basis.
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