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If using E10 in your vintage Pontiac is okay, E85 must be too, right? Wrong! E85 fuel is a high-level ethanol-blend of as much as 85 percent, depending upon the climate, and the fuel systems and engines that can operate on E85 are specifically designed and calibrated for it. One can certainly convert a vintage Pontiac to E85 operation, but that's an entirely different subject than what's presented here!