Just a heads up. I ran 30% in a stock savage 25 and that engine lasted over 10 gallons of fuel. 100% stock no shims, stock glow plug on 30%. It finally got wore out and a friend wanted to buy the truck so I sold it to him and he put a new motor in it and still has it today. 30% is perfectly safe if you have it tuned correctly. Mine ran like a champ.