At this scaling there isn't much you can see; but the result, for the third of the three times we have taken the Runoffs top three engines, is less than 1%.
http://sccaenterprises.com/updates/F...11%20graph.pdf
Two of the three years the best motor did win, but in only one year was that even a 1 HP advantage over 2nd place. 1/173 is not much!! In one case the same motor has been back twice and has improved since the original build to return #1 and then return #2...aging like fine wine?