Gas Hybrid

Why do people lie about Hybrid cars getting better gas Mileage?

Given that the Hybrid car can have it's batteries and electric motor taken out and get better mileage, since it is lighter by about 1000 lbs. Would it not be simply up to statistics that you might save enough gas at stop lights and brakeing to make up for hauling around the extra 1000 lbs all day?

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Hybrids get better mileage despite the extra weight because the electric drive is several times more efficient than the gas portion.
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I would phrase this question differently: why not remove the gasoline engine, add a few more batteries for the electric drive, and improve the mileage even more dramatically?
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The cost of electricity to drive an all-electric vehicle is only a penny or two per mile.
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Here's a hybrid calculator, which allows the comparison of various hybrids versus gasoline vehicles:
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http://www.eere.energy.gov/cleancities/hev/calculator/single.php

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