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TM,
In the last five years I've been involved in many renewable energy feasibility studies, probably 50 to 100, and I can only think of three that have resulted in hardware on the ground. This is almost always a decision based on economics.
I agree that most people buying fuel-efficient vehicles don't take economics into consideration in their car choices (or at least they don't do the math), but neither do people buying a Mustang or a Corvette or an Explorer. They might determine if they can afford the car payment, but probably don't give too much thought to the other operating expenses.
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