“So to get a lawnmower to run as cleanly and efficiently as a car engine you need 1)a catalytic converter, 2)mass airflow sensor, 3)temperature and pressure sensors, 4) electronic fuel injectors, 5) Oxygen sensors, and 6)a computer to run it all. And this is a minimum.”
You forgot $$$$$$$
I thought that was implied.
The Fastest Lawn Mower In The World
https://www.youtube.com/watch?v=B5c4ImblVpc