Hi Pete

I have a Pegaso Trail with the same motor. I find the bike runs better on 91 than 95. It seems to run best on Mobil 91 with 3% ethanol. BTW I fitted a K&N air filter, a Power Commander and run a custom map. The PC made a big difference (well worth it), the custom map is a little bit better, but prob not worth the $300.

Cheers

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Frodo
06Aprilia Pegaso Trail 650
New Zealand