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E5 vs E10


grumble56
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10 hours ago, chrsfrwll said:

The current info from Vittorazi is that their engines are tuned for E5 95RON and use of higher ethanol/lower RON invalidates warranty...

I've noticed that in the manual, and have gone out of my way to find pure gasoline, since nearly everything in the US is E10. OTOH, I've never heard of anyone being refused warranty for running pump gas.

My speculation is the strongest effect anyone's likely to notice is the frequency at which they have to replace the carburetor diaphragm. (They get flabby faster when exposed to ethanol.) Maybe a few % less fuel consumption, since ethanol has less energy per weight than gas.

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