Outdoor Power Equipment (Lawn Mowers, Snow Blowers, Chain Saws and more) Discussions

So now that Amoco Ultimate no longer exists, and all gases have 10% ethanol in them, and most all gases have large amounts of Nitrogen-based or other detergeants, what is the best fuel to be running in small engines? All of the gas companies have gone to skimping on the quality of gas in order to help improve their margins, but I'm sure that some above others have better or worse chemical make-up for use in small engines. I understand that some of this has to be based on speculation because the gas companies do not release any information on what chemicals they add to the gas; they only say "it's better".

Personal Experience: when I used Amoco Regular in my Pontiac Bonneville '98, my gas mileage was about 6 mi/gal higher than when they switched to BP Invigorate Regular.