I run 11-5's on all my .40's. You lose a little speed, but it'll have your superstar off the ground in less than half the distance of a 10-6, and you'll have that extra little umph you need to pull it out of a tight spot, and ii'll idle a bit better. You can also pull the baffle out of the exhaust and still keep enough pressure in your fuel tank. I use Byrons 10%nitro 16% oil. I've heard that some manufacturers put additives in the fuel to darken it so that it's easier to see in the lines, but that it takes away from overall performance. *shrug* But I don't know, I've never tried them.