Powermix 25:1 fuel mix is a 94 octane premixed, ethanol-free R/C fuel. What makes it the best? Powermix 25:1 is extremely stable and has a long shelf life - over 2 years in its sealed container and several months in the fuel tank of your R/C vehicle. We thoroughly test our 25:1 fuel in a wide array of small 2-stroke giant-scale R/C engine applications. Powermix has the highest quality 100% synthetic oil on the market. It produces tons of power, improves throttle response, and provides a smoother and more linear power band compared to pump gas. You'll experience easier tuning and lower engine temperatures. Powermix also eliminates fuel system failures, downtime, and costs related to ethanol-blended pump gas.