There is no magic here. It's
There is no magic here. It's accomplished by retarding the spark. This means if you run "cheap" gas, the ignition controls simply delay the firing, wasting fuel sending raw gas out the exhaust. Everything comes with a price, and for this choice the engine will run much dirtier, have less power, get lower mileage and have a shorter life. I guess it's easier to look at a number on a gas pump than calculate how much money is actually being wasted. And such a tiny motor, with a ridiculous compression ratio, will have a hard (and short) life.