[Diesel_Dave]

First off, where did he get E65? I don't think I've ever seen that for sale.

E65 would have around 20% less energy per gallon than gasoline. I'm not sure what he claims he's done to his engine, but getting 20% better engine efficiency takes some very serious modifications. 20% better vehicle fuel economy is one thing, 20% better engine fuel economy requires some major, major changes.