90 octane non-ethanol gas. Rec is abbreviation for recreational, as in boats, ATVs, etc. Good for most anything with a carburetor, as long as the octane is sufficiently high. Works nice in my 340. Higher than 90 is available some places, but not near me. I'm about 2 miles from a Great Lake, so easy to find. I use it in four carbureted engines.
