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The slew of hibrids out now currently have regenerative braking.
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I know, I own one. That's my point. that idea or system is great. Why let the energy go to waste? if we could find a way to store the energy without batteries, then we would be able to increase mileage without the disposal issue of batteries.
Your point about mileage per pound is interesting. I did a quick search and found
this chart. If you add up the trucks and rail figures, you get about 250 billion miles. divide by 2mpg and you get 125 billion gallons. If you take the passenger vehicles and include the "other 2 axle" miles as well and divide by 23mpg, you get 115 billion gallons. Lower. So if nothing else, they are very similar. Not quite the picture you paint. Please correct me if my math is wrong based on these old numbers from '93. It's all very interesting.
I think the gov't should be looking at all these fuel consumers, including home heat like you mention. Not just focusing on passenger cars. That's all.