After watching the Worlds, I wonder what engine temps those guys were running. I assume most were going for mileage and most seemed to have very little smoke except a small bit exiting corners. The smoke trails that I saw seemed much less than your typical race (especially a club race). I believe a comment was made about Hara's first run in the final, relating to his heavy smoke trail. At his first pitstop, the commentators mentioned his engine was being leaned and indeed his smoke trail thinned. I suppose the DVD will show better, but it sure seemed that the straightway runs were virtually smokeless.

Somewhere it was mentioned that mileage comes from a very lean bottom and a somewhat richer HS for cooling. It sure didn't seem that way to me. How did the Worlds tuners seemingly run so lean?