The "Gas Cities" gas station chain sell a 100 octane Racing gas. Its a blue in color stuff with a more pleasant oder than regular gas. Myself and 3 others use this stuff in our planes at our field and did all this past season. It burns very clean, mixes very well and have had "0" issues with this stuff. I think there are a few advantages using this gas and the only disadvantage I have found is the $3.85 per gallon price. As long as I can get this stuff I will continue to use it. Happy New Year, walt