Here is another thought. How well was the engine run in on these cars that were reviewed in these magazines that the jato only hit 50. I have found that with my limited experience with nitro, that my motors tend to get faster and faster for about a the first gallon or two. Also what fuel where these mags using of the shelf 20% oil or a race blend with 12% or less fuel.

My thiughts are that the jatos that where reviewed in these mags were only doing 50 ild also think that you'ld quite easily get a 10% or more increase in top speed by running the motor and car in for longer then the mags do using different fuels and fine tunning those needles a bit more.

As for increased power by running lean, i recently had a bad experience with a dodgy fuel tank lid, my buggy was just lighting the wheels up comming out of corners at a bout 1/10th throttle and went passed some highend engines done the straight like they were standing still. i only did 2 laps before pulling it in the pits but that was enough to stretch the rod and ild be guessing that would have got me almost an extra 10 000rpm (i know it sure felt like it).