1959 Opel and it was accomplished way back in 1973! They seem to have forgotten this 'technology' somewhere..
http://www.race-cardrivers.com/Shell Opel.htm
It used 'Super-Heated Fuel' hence all the insulation on the engine, engine has to run very, very hot for the SHF to work. The chain-drive they used would also be pretty inefficient compared to some of the technology we could probably use today compared to the early 70's, I wonder what MPG it could do combined with today's light-weight stuff!
Edit - 376MPG not 365MPG in title, even though 365MPG is amazing!
http://www.race-cardrivers.com/Shell Opel.htm
It used 'Super-Heated Fuel' hence all the insulation on the engine, engine has to run very, very hot for the SHF to work. The chain-drive they used would also be pretty inefficient compared to some of the technology we could probably use today compared to the early 70's, I wonder what MPG it could do combined with today's light-weight stuff!

Edit - 376MPG not 365MPG in title, even though 365MPG is amazing!
