Seems like what is happening to glow engines is happening on full scale cars too ?
http://www.engadget.com/2011/02/03/suck-squeeze-bang-bust-the-death-of-internal-combustion
PS: I am sure Capt Manish has some comment on this ;D
"Each time you put 10 gallons of gas in your car only three of those are actually used to move you forward."
NICE
the same technology has been applied in a hybrid car by toyota...it was being shown on discovery science a few days back
Any new technology will have its hurdles for mass acceptance.
Its true that IC engines have only about 20% efficiency. However, with all the investments from the oil companies, IC engines are not going to vanish all of a sudden. In fact, these companies would directly or indirectly suppress any new technology that might risk their bottom line business.