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Where I live gas is at $2.50 at 10% Ethanol at 87 octane and $2.90 for non-ethanol at 89 octane per gallon. I understand that smaller engines do not do well on ethanol. Is the loss of efficiency from containing ethanol worth the saving? Is the cost difference between the 2 either way worth the mileage and maintenance? Does smaller the engine equal less efficiency on ethanol?

  • What are you considering a "small engine"? To me a small engine is used on a lawnmower. – Pᴀᴜʟsᴛᴇʀ2 Sep 13 '18 at 21:00
  • Where do you live? As a resident of the UK I'm quite horrified! Our pumps provide 95 octane as standard and between 97 and 99 octane performance fuel. Race fuel (available on the pump at a small number of filling stations, usually near race tracks) is 102 octane. Most European vehicles specify a minimum of 91 octane fuel. – Steve Matthews Sep 18 '18 at 8:26
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small engines don't need the extra octane and the extra octane won't produce any higher efficiency. However, non-ethanol gas doesn't attract water link ethanol gas, so it doesn't corrode the inside of the carb. That's why it's preferred. But you still need to add fuel stabilizer if you're going to keep it in the tank more than a month.

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