low mpg

[bikerphil]

Yep, down here in S FL they have a chain of gas stations called Wawa and they are always busy. I have fueled up at many different ones with 89 E0 and they all give the same results, about 4 MPG less than the 87 E10 in both my 1100's. YMMV

Just to add, my bikes idle about 150 RPM slower with this E0 and throttle seems a little flat when accelerating from cruising speed. I'm just guessing that the E0 makes the bike run slightly richer than the 87 E10. YMMV

[DiverRay]

It WILL make it run richer. E10 is lighter than E0, and has less BTU's per pound. My bike is tuned for E0, as I can find it easily in Idaho. It is 87, not 89, but the bike runs well on it.

[skids]

These engines are not high compression and low rpm. Premium gas is slower combustion for longer strokes. I get best economy with regular and no alcohol.
my fuel economy drops 5% for 10% alcohol in the mix. I am not convinced that they are not adding water with the addition of alcohol...

[Bonz]

The bike needs 87 octane, no more. Compression ratio is low on these. They would run on gasoline from a puddle after a flood if you can find it. Running higher octane, for any other reason, (besides zero ethanol) is only making the rider feel better, and does nothing positive for bike performance.

[LAB3]

The bike needs 87 octane, no more. Compression ratio is low on these. They would run on gasoline from a puddle after a flood if you can find it. Running higher octane, for any other reason, (besides zero ethanol) is only making the rider feel better, and does nothing positive for bike performance.

Everything I've ever read on the subject confirms this. There's a clip from the TV show "Enginemasters" On YouTube where they put an ordinary everyday driver type engine that takes 87 octane fuel and they put it on the dyno. Then they put in progressively higher octane fuels into it and run it on the dyno again. Long and short of it, higher octane gives no more power

In my case I'm thinking the experience I had with the 93 octane E0 had more to do with the freshness of the gas and lack of ethanol than anything else.