We have to optimize our engine designs for the fuels we can get with an eye toward MPG vs costs , and be willing to step into a modern world. If you are still
lugging 6500 pounds around to commute to work by yourself, you are not adjusting. You are jousting with the general public . Along with smaller cars with better aerodynamics is a society that clamps down on the type A nut jobs
trying to run everyone down while doing 90mph. Their days are numbered.
The "Privilige" of driving a motor vehicle will be safely laid in the deserving
hands of people who drive "nice" and have manners such that everyone can drive safely to their destination in a 1000 pound vehicle without fear of
some nut tailgating them . The nuts will be riding the bus. Times are changing.

Dan

Omnitek offers those, too, but no mention of price that I could find on their site:Can't be cheap!

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That depends on what you consider practical. Currently, around 1% of a vehicle's power is to propel the driver*. Now; we will never recoup the other 99% of that; but, I'm sure there can be continued improvements on that with a certain level of acceptance.
Right: and part of the issue is that for such a large expenditure, you need to buy at least what you will need for the most vigorous use you will encounter. (some go way beyond that, but that's another issue).
There are other solutions to overcome this, but it's a major change in the way of thinking.

*Statistic from NOVA: Car of the future (hosted Click and Clack, the Car Talk guys)
They discussed a lot of the issues in technology, infrastructure, and perception. Very informative. Unfortunately, I was left with the impression that the technology is not progressing as fast as I thought it was.

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Numbers are not case sensitive. (me)