RE: New servo for my havoc
Servo is fine. I really wouldn't mix fuels, even of the same manufacturer, but theoretically, it shouldn't cause a problem, provided they contain the same types and quantities of oil. The resultant fuel from mixing 25 and 30 percent would be illegal in 25% class obviously. You usually will need to retune an engine when changing fuel % too, generally an engine will be happiest used with the same fuel throughout its life, as long as it's a good fuel of course. I suggest you pick a fuel the engine likes and stick to it.