Thread: Premium Fuel?
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Old 03-24-2013, 12:56 PM   #7
BIRDMAN
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Join Date: Jun 2011
Location: Boston
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I find that the difference in MPG when using higher octane becomes more apparent with more displacement. The larger American V8's I find will gain 10-15 HP with higher octane fuel. That extra power through the RPM range technically could allow the engine to operate more efficiently if you don't need to get in to the pedal as much to achieve your desired speed.

However, a .5mpg gain when you're getting 27mpg is negligible vs. a large V8 getting 12-15mpg it's pretty significant and (maybe?) worth the extra coin.
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