The only fuel additives that do anything to clean a fuel system are techron and amsoil. Interestingly, even though they often required high octane by the service manual this system let them burn very low octane gas without missing a beat. Because it used the spark plug resistance as a computer input it was able to remap the fuel system on the fly and tune for the higher octane to get a tiny increase in power and efficiency. The only vehicle I have ever found that gained any advantage from higher octane was a Saab. PS- the ONLY fuel related issues I've ever had in the last 35 years are with a tank of NON-Ethanol fuel. It's higher quality and has more/better detergents and other beneficial additives than the lower class of fuel at any octane. NO ENGINE PERFORMANCE ISSUES with this stuff. That's on mostly city streets with stop and go traffic. Usually the commute results in low to mid 50s mpg but soon I won't be commuting any more (retirement) so that will be running errands in the local area. I've had over 60 mpg with this gas on a few tanks last fall while travelling. I use 87 octane E-10 and no other additives. Iowa is a corn state and a major producer of Ethanol so. I also live in an area where non-Ethanol gas is more difficult to find. This scoot is designed for regular (87), not premium (91+), so that is what I use. In fact, for some it was found that mpg was worse using a "higher" grade of gas (higher PON). A few other forums I belong to have riders who work for gas and oil companies as well as engine experts (racing engines and others) and have determined that using anything other than what the manual says your scoot needs is a waste of money.
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