>>>what would you call it, and what would be the specs on your >>>vehicle?
Most importantly:
It would get the equivalent of 150+ miles per gallon (by using composite lightweight parts, regenerative brakes, flywheels***). It would run on LPG, fuel cells, Ethanol, M85, gasoline, or flubber.
It would offer respectable performance:
0-60 ~7 seconds
top speed at least 100
good handling
quiet, under 70dB at 70mph.
reasonable price ($25k-$35k)
range: 500 miles
You asked for what I wanted and this is it! Such a car doesn't exist today, so I choose to have reasonable price as my top car purchasing criteria. This means I will rely on my college engineering friends that now work for Ford to help me get A,B, or X plan cars!
I keep telling them to design me a car with the above specs! Unfortunately my friends manage assembly lines for AC ducts, radio fascias, and control knobs.
***A little bit of an aside on flywheels:
rotating on magnetic bearings at 100,000 rpm on gimbals, a 2 or 3 pound flywheel in your car could cut 0-60 times by 2-3 seconds and increase gas mileage at the same time.