That's changing, there are hybrid customizers who are converting hybrids to plug ins.
The auto manufacturer's wont be far behind.
some are claiming in access of 100 mpg.
http://www.calcars.org/vehicles.html
Never heard of people doing that before - thanks for the link. I think that's a great idea (optional plug-in) if we provide non-oil based power to recharge them (enough building oil-fired power plants).
There's no reason we can't be much, much more energy independent - there just needs to be a general incentive to avoid oil waste... Which is hard to acheive when oil is cheap... but waste becomes painful when oil gets expensive.....