I've used 5 yr old fuel that ran perfect. But you have to keep it in the dark and the temperature stable

Fuel containing Nitro that is exposed light and especially strong sun light for extended periods will not run correctly in your engine. You will find it impossible to addust the needle valve. The engine will sound rich all the way up to the point of lean shut off. If your engine continually quits as it begins flight even after readjusting the needle valve, suspect the fuel.