Which electric generator is most energy efficient?

Which electric generator is most energy efficient?
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Answer :

It's hard to say which electric generator is "most" fuel efficient. It depends on the type of fuel it uses, for one thing, and most popular generators are powered by natural gas or diesel. If cost is your biggest concern, look for a generator that uses a cheaper source of power. When comparing how much fuel each generator uses, also consider the wattage, or else you may be comparing apples to Oranges.
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