[JonyRR]

serious tuners bias their whole tuning setup towards a particular brand and formulation of fuel...with 'spec fuel' you dial in everything towards max efficiency using the type of fuel you have.

visit the VP site and look at all the difefrent formulations...all different for different reasons and applications, yet all 'gasoline'.

If your total state of engine tune, compression ratio, ignition timing, a\f mixture was optomized for say, 87 octane regular and it ran most efficiently that way, then 87 octane is the 'optimal' fuel.

but you can certainly tune for better gas..that's why a 'dual map' addon like the latest PC or a reapidbike is cool, one map can be for pump gas and one map could be for VP110 with a 20% by volume nitromethane load.

if your scoot runs bettr (and has been said a butt dyno is notorously inaccurate) with something beyond standard pump gas, then something is not optomized for pump gas.

of course you can pull more power with premium or specialty fuel..if you tune for it.

my HD streettracker is dialled in for vp u4.2 and 20% by volume price fuels max race (40% by volume nitromethane)...timed and jetted for this particular combo.