How to make a 4 year old happy

I think he's going to be a gear head for sure....

Today we were doing some work with my shop truck

"Daddy it has 2 gastanks...."he says

"Yes but we only use one Steven..."

"It would be faster if you used both Daddy..."

"Because we'd use twice as much gas?" I replied

"Yup"

He seems to have it all figured out. More fuel, more power 8)