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> Hey Jim > > What is the best octane for a stock 1600 CC DP (1967)? > > Should I stay away from octane boosters? Would this help my mileage any or affect the head temp? > I use 89.5 octane in my '71 FB AT. Never had a knock, and I kind of drive like Leon. 80-90 mph. I do run my fuel pressure a little on the high side, but figure that a richer mixture will not have as much tendency to knock, due to cooler combustion temperatures. BTW, now that my odometer works right, I checked milage. I am getting 29.5 on the last tank. Russ Wolfe russw@classicvw.org http://www.classicvw.org/ ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/