Interesting data
You could take it 1 step further and account for podium probability amount by entry percentages per race to give a more accurate result. For example using your scale, race A has 10 overall entries. 4 Geiser trucks, 3 brenthels, 2 masons and 1 fusion. This would give a 40% chance of a geiser winning, 30% brenthel and so on. You can use these percentages to handicap the points awarded by multiplying it to the overall total and subtracting. If geiser was awarded 10 points total for finishing trucks in the top five, the adjusted total with the podium probability factor of 40% would score 6points(10-(10x40%))=6pts This may equal out the numbers based on actual performance and not the fact there were just a lot of one type of truck entered. Therefor if the fusion found its way to the top spot it would have actually taken in account its odds of getting there and reflect that in points allotted.(5-(5x10%))=4.5pts Lots of math but really cool data! I’m sure someone much smarter than I can come up with a better performance scale, just a quick attempt on my part.