3.30 for premium in houston, which is what i run. I recently read about a guy who made a 6 stroke motor. I thought it was cool as hell cause its realy really effecient. After the intial for strokes, on the last compression stroke it injects water into the combustion chamber to create a burst of steam to push the piston down 1 more time and to use up all the heat thats usually lost in combustion engines. I thought this was cool as hell.