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The thread that wouldn't die...
For what it's worth, since my the last posting in the thread in December of '07, I've continued to run mine on the lowest octane fuel with excellent results. Fuel mileage has even been better, although this could be in part because the engine is still getting less stiff with wear.
I do make it a point, though, to use major brands whose quality control I trust across all grades of fuel.
> "As for the E10, dunno. Do Triumph approve it's use?"
Yes. That's specifically stated in the manual.
Some of the fuel I've used has been E10 with no perceptible difference in performance.
It's not precisely accurate to say ethanol "burns faster," BTW, but it does contain lower energy per unit of volume (not as many carbon bonds per molcule of ethanol as in most of the compounds that make up petrol), so it's reasonable to expect less fuel economy. However, the E10 blend contains so little ethanol that I'm not expecting to see a huge difference in the mileage figure. Once my bike is run in enough for the mileage to stabilize, I'll check it in detail, but I don't expect to see much more than one to 1.5 mile per US gallon difference.
The difference definitely shows up in E85, according to friends whose cages use it--but we won't have to deal with it in our current Triumphs, and probably not future ones any time soon.
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John
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