Every event has a max worth of 100 points. If you don't win the 1/4 mile but are very close you can receive 90-96 points maybe. The same with dyno and the other events.
If you come to the event with putting out dirty air because of no cats or some other problem, you can expect to receive somewhere near 0 points for the emmissions.
Emmissions has caused many of the strongest cars not to place high after all points were tallied. It is why the stock Modena won in a tight one over a Supra i think.
I have some of the articles at home. Fuel mileage is rated also.