I think it's very important to consider the energy needed to make a new car. If the energy used to make a new car is even 1/4 of it's price it would take a very long time to make up that energy in fuel even if the new car is twice as fuel efficient. Someone who drives a Pickup into the ground every 20 years may be more green than someone who buys a new "prius" every 5 years.... Or maybe not. Just something to consider.
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