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Premium gasoline, ie. higher octane number, will permit greater ignition advance in a modern auto and might yield a bit more horsepower and a bit more mpg. Is it worth the price difference? In the USA E10 gasoline, 89 octane, has a tax break that usually makes it cheaper than straight gasoline, 87 octane.
Check out this web site, http://www.toptiergas.com/, for brands that meet higher standards of detergant additives for all grades and types. I make a point of buying gasoline from these retaliers.
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