Table: derek daly
Question: What type of engine (Ford Cosworth DFX or Buick V6) contributed more to overall performance in terms of points?
Step 1 (Operation, Filter): engine
Step 2 (Reasoning, Aggregating): AVG, points of Ford Cosworth DFX
Step 3 (Reasoning, Aggregating): AVG, points of Buick V6
Step 4 (Reasoning, Other Commonsense Reasoning): contributed more
Answer: Buick V6