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Look at it this way:
Over the course of 100,000 miles, a Tahoe hybrid at 21mpg (combined) will save 1121 gallons of gasoline versus a conventional Tahoe at 17mpg. A Civic hybrid at 44mpg saves 853 gallons versus a conventional 32mpg Civic. If a person is going to drive a big SUV anyway, there is a greater impact overall if it's a hybrid than if the person driving a small car switches to a small hybrid.
In a perfect world, only people utilizing the extra capacity of a large vehicle all the time would drive one. In a reality where this does not happen, anything that mitigates the impact of these vehicles should be encouraged.
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