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Fuel Grades for 1971 914 1.7 all stock injection

Engine

Vehicle Information: Model (914/4, 914/6): 914/4; Year: 1971; Engine (type, size, modifications): 1.7 litre, Stock; Total Mileage: 57K;

Given the fact that most gas stations in my area now only sell gasoline that's 10% ethanol, what fuel grade (with or without ethanol) will give me the best performance in my all stock 1971 1.7ltr injected 914? Also, I have a power fade from 3200 to 3500 rpm in all gears when accelerating, I'm guessing a vacuum leak...

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