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JacinF=> premium gasoline. Is this still recommended ...? Fuel grades and burn characteristics have drifted over the years; what was regular in the '60s is more like premium now. I use premium (around here, 91 octane) exclusively in mine. Higher-octane fuel burns more slowly, keeping the heads a little cooler. I'll agree with Scott that if you don't have detonation, it's not a problem per se, but I think it's good practice to favor the heads wherever possible. Steven Ayres, Prescott AZ '66 Big Ghia ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org