This came up in another thread, but I think it deserves it's own thread. Eggzackerlee. This is a subject that was once fairly prominent, but (just like 'planned obsolesence') it has been deliberately and quietly dropped from social discourse. Despite 50 years of "progress", more than half the fuel still comes out the exhaust port unburnt. Dumb dumb dumb dumb dumb. FWIW, as I understand it, Ralph Sarich was disturbed at the fuel consumption of his radical Orbital engine (an insoluble problem sadly). He experimented, then fitted his own design injection to a Suzuki 3-cylinder 800cc (?) motor fitted to a 2-litre Holden Camira, then drove it from Perth to Adelaide (from memory) at normal speeds and performance levels and got in excess of 90 MPG. His fuel injection design managed to burn over 90% of the fuel, which is where he got the power and economy from, instead of just blowing most of it out the tailpipe unburned. That technology was bought and buried. Personally I find that criminal.