ATS Racing Flex-Fuel sensor kit. This allows the next step above a dual map set-up on your MR2. Is flipping that switch when you change fuels just too difficult? Then this FF sensor kit is for you! You still have to put fuel in your car all by yourself, unless you live in Oregon, or New Jersey, but once this sensor is installed and TUNED, it will correct for Ethanol content. It's really pretty handy, as you don't have to worry about running your fuel tank down to fumes, and then try and find a station. You can just pull up, dump in whatever swill is handy, and get back on your way. If you run low octane pump gas frequently you might want one of these too: ATS Knock Sensor Kit for ECUMaster