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post #1 of Old 11-25-2012 Thread Starter
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ethanol vs. non-ethanol gasoline

to start, I am an authorized OMC (Evinrude) Mechanic. Or, I was 15 years ago, but everywhere I worked was so unethical, I had to find a new line of work after 4-5 years working at a few different marinas... (this SHOULD explain why I own a sailboat, not a motorboat, but I digress! lol)

ANYWAY... I just got back from a 4-day sailing trip with my 12-year old daughter. I have a little 5-hp outboard Mariner on my 24' trailer sailor. Before I left, I filled the tank with 92-octane NON-ethanol gasoline (like I always do). After we arrived at our destination, I had to re-fuel and the ONLY fuel I could get was 10% ethanol gasoline. I didn't think anything of it since it was the same octane...

My tank was 99% EMPTY when I refueled. As soon as the 10% ethanol gas made it thru the fuel line, I lost power, performance and speed. I had always heard ethanol gas was bad. Previously, I had noticed a SIGNIFICANT increase in fuel mileage in my truck when using NON-ethanol gas, but I thought is was “circumstantial” – although it was “circumstantial” enough that I keep using NON-ethanol gasoline...

I plan on testing the outboard with non-ethanol gasoline latter this week...

ANYONE else notice a HUGE significance in performance between ethanol and NON-ethanol gasoline?
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