I use Omega 5% in all my engines. I've been running that fuel for about 6yrs. I put it in everything from old worn out 40SF engines up to OS 4-strokes and TT 4-strokes. I've run it in Moki 1.35, Moki 1.80 and the 2.10 I've run it in the MDS 1.48 and the MDS 2.18. I've run it in ALL the Big Cats from the 2000 all the way up to the 4500 (Thats Super Tigre for you newbies--and YES, it IS spelled T I G R E and NOT T I G E R) I've run that fuel in every engine I've owned since 1999.

17% oil. 30% castor and 70% synthetic

Haven't cooked one yet. I buy 5% 'cause I'm cheap. I used to run 10% and even 15% sometimes--but just don't see the need for it anymore. I put big enough engines on my planes that I'm not looking for absolute max power or max RPM out of each engine. I usually overpower my planes by at least 50% over the factory recommended size. Sometimes I've got twice the max recommended engine on a plane.

Keep in mind that my glow planes are small 40 size 3D planes. Most have a .75 engine--thats on 40 and 46 size planes.

When you have that much HP hanging off the firewall--5% works just fine.

I did run a gallon of 20% nitro through a Tower Hobbies .75 once. It was neat and had rediculous power, but not worth the price at $24 a gallon.

For just normal sport flying--use 5% or 10%. Anymore than that is a waste of money.

Start competing in pattern or racing or something else where prizes and money are on the line--I'd probably jump way up to 30% fuel. But for Sunday flying--anything more than 10% is wasted money.

If your flying a brick with an old Royal .40 and you need 40% nitro to get it off a 600' runway--knuckle up and buy a new motor you cheap turkey. [sm=lol.gif]