I am considering a new car and the Mazda3 is on the short list. The Skyactiv motor is a 2.0L, NA, DI engine that runs on 87 octane E10 and gets 40 mpg. Compression ratio is 12:1, 13:1, or 14:1, depending on which Mazda document you read. Of course the engine is really too new (first model year...