Was on a tractor board tonight and came across this link regarding six stroke motor designs. Turns out there are several designs and they all essentially reduce fuel consumption by 40%, eliminate air pollution, significantly reduce carbon monoxide, eliminate the need for a cooling system and have essentially the same power output as the same sized four stroke motor. Never heard of a six stroke motor but after reading the information it makes sense. Sign me up for an RL with a V-8 SIX stroke motor and an eight speed automatic transmission. 40 miles per gallon, 400 hp and living large!

http://en.wikipedia.org/wiki/Six_stroke_engine

 

 

Another high efficiency engine concept that supposedly is being considered by automakers. This one sounds plausible to me.

http://www.autoblog.com/2008/04/19/s...to-automakers/