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Old 04-27-2013, 06:48 AM   #16
Gnarly Adventurer
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Joined: Jan 2009
Location: NH/MASS Border
Oddometer: 135
I've found on older vehicles that have carboned up over the years high octane fuel works better and the cost per mile works out about the same.

On big pistoned single spark plug lean tuned bikes (like a Kawasaki Vulcan 1500) low octane works better as it ignites faster for a more complete burn.

Many vehicles have high compression these days but can run on lower octanes as they have a knock sensor to pull back the timing reducing detonation.

Most bikes have a simpler setup with out knock sensor so are "fixed" at the factory for a certian octane fuel and will not benefit from higher octane though they will run fine on it.

Given the choice I'd run the non ethanol fuel in the lowest octane available...
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Old 04-27-2013, 11:03 AM   #17
frosti1 OP
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Joined: Mar 2013
Location: MinneSnowda
Oddometer: 10
Quick update: I filled up yesterday, and the octane was 91 rather than the 93 I remembered.

Also, the price per gallon was $4.09 for premium. The regular was $3.59. So it was only a $0.50 per gallon increase. Well worth it for me. Especially considering the total cost of the fill: $4.99.
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