Can fuel go bad? If not I will buy large amounts, and some other extra parts, props, fuel line, wheels, ect. I need to join a club still! But I hope to find a used size .40 trainer, that can fly. So what kind of fuel do I need to use in a thunder tiger 15? and what do I need to run the engine to test it? I've been looking at fuel on tower hobbies, it seams to be fair priced. any other sites?