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I used to run Petro 94 exclusively but with their winter gas switched to Shell 93. Sent PTF a log of my car on both fuels and they said Shell was running better on my car. Neither was great and I had to switch to Map 1 (ACN91) but the car feels good. Also noticed Shell reads at 11% ethanol vs Petro at 10%. Will test more once the summer gas becomes available.
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