First off, my Lancair 235 with an O-235 gets 34-36 mpg at 14,500 dalt at 197 mph TAS. How's that for efficiency! I can even get 50 mpg at 150 mph TAS, but who the **** wants to fly slowly? But I don't even come close to Klaus Savier who gets 50 mpg at over 200 mph in his Vari-EZ. I'm very glad there are those who are interested in the environment and keeping carbon use low so that those of us who don't give a **** can use all we want! Thanks!