A 50 or 75 percent improvement would probably put a gas engine beyond its theoretical max efficiency.
No, the theoretical limit is the energy in the fuel, which is about 275 mpg. The problem is that most of the energy is wasted producting heat.
24 posted on 03/04/2010 5:00:37 PM PST by SampleMan
(No one should die on a gov. waiting list., or go broke because the gov. has dictated their salary.)