RE: What's that smell?
It actually isn't that high octane gasoline smells any different from 'normal' octane gasoline. It's that the high performance engines that are using the high octane gasoline have their timing and fuel/air mixtures set to peak power, resulting in a lean burn condition and the great smell that is associated with NASCAR, SCCA, etc. racing. This also results in a slightly grey, powdery film on the inside of the exhaust system. The great smell from our small glow stuff is from the Castor oil. If you want to test this, run one of your engines 'normally' and then add a couple of ounces of castor oil (such as from Sig) to a gallon of fuel and run that. You'll notice the difference.