Im having great luck with Redline RL-3, its nearly the same as their 85+ but in a more economical gallon jug. Its expensive at about $25 a gallon, but to me its worth it, if it gives me 1-3mpg boost and definately for its lubrication package. I also use Redline 2cycle ashless oil at a mix of 1 oz per gallon for its lubrication of my pump. I have used Powerservice and Standadyne, I couldnt tell any difference at all with Powerservice, with Standadyne I noticed that my motor was quieter at idle, with Redline additives I am noticing a big leap in noise and I am gaining a few mpg. Only drawbacks to Redline is that its only mail order, unless you live near a distributor. Redline is also more expensive than the others too..but u get what u pay for IMHO.