I have done some research and have found that the Pulstar Pulse plug seems to be the best for E85. I'm not sure if that's true, but they cost $24.99 each, WOW!!!. I'm using Autolites 23's gaped @ a tight .035 and they seem to work fine, but they claim they will out perform any spark plug out there. My question is : Is anyone using this type of plug? and if so is it worth the extra money for the performance gains they claim. You can check them out on there web site. www.pulstarpulseplug.com Let me know what you guys think.