ORIGINAL: combatpigg
I can mix 75% / 25% / 0% for about $12 per gallon and running that mix saves the cost of installing a seperate smoke system.
Your experience with FAI setups will serve you well with one of these engines if you ever decide to go with one, the oil aids both in the lubrication and cooling of these when they are really spinning up.
I was going to use the new one I have in a DF setup originally, but the more I think about it the more I am drawn to putting it in a clean airframe with a prop.