I tracked a 2008 Shelby GT500. Purchased the vehicle new and immediately replaced the suspension, brakes, supercharger, changed gearing, added long tube headers and exhaust and installed a tune along with other mods. Purchased in December and ran my first track day mid April. The car ran amazing. I spent the following track events sorting issues and dialing it in. As the year progressed the temperatures increased and the car started to heat soak causing the engine to dial timing out. I replaced the radiator and intercooler radiators with triple pass radiators with no positive conclusion. I eventually called Ford Racing and was told ethanol fuel was my issue. It seems that alcohol burns at a higher BTU than gasoline. I was also told that ethanol in a tank tends to separate from the fuel and it's common to find ethanol based fuels with up to 60% ethanol. These fuels also have a shelf life of 6 weeks, and if fresh fuel is dumped into a tank with existing fuel, the quality diminishes instantly. The next track day I filled the car with non ethanol and packed non ethanol to the track. It was hot this weekend, yet the car ran cool and strong. Who would have thought? I run non ethanol in everything unless not available. It also attacks plastics, rubber and tends to varnish fuel components which over time changes your fuel mixture causing lean run issues. I was also told that it increases carbon deposits on the cylinder heads. I'm a definite believer