I drive a 2006 Pontiac Vibe. 87 octane with 10% ethanol vs. 88 octane with 15% ethanol. Reformulated area. Right now the 88 is about $0.10 cheaper (3% cheaper) than the 87. Is there a rule of thumb as to which one I should buy based on the price difference?

Posted by daGroundhog@reddit | askcarguys | View on Reddit | 4 comments

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4 Comments

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Mean_Farmer4616@reddit

the tiny fuel savings isn't worth the potential damage to the fuel system that was never meant to handle it when new, but now it's 19 years later.

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Confident_Season1207@reddit

There's no harm to the fuel system with e15

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StoicSociopath@reddit

2001 and on was made to take 15 to 20% ethanol

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newtekie1@reddit

E15 had about 1.65% less energy than E10. So you should expect about a 1.65% lower fuel mileage. So saving 3% in price would probably be worth it. But you're worrying about pennies.