Unless you are in the great state of "Kalifornia". Where not all the nuts and fruits are on the trees,
If you get caught with leaded gas, even in your lawn mower, you are subject to a nasty visit from the AQMD.
And, I would bet they stick your Jeep, Truck, cars, weedwhacker....etal. Just to prove that you are a scofflaw.
Ain't the EPA grand?
I live in a very sensitive area for smog, and yes, I do remember the days you could not breathe because of the smog.
But adding alcohol, and other junk to our fuel causes the vehicles to use more fuel, so the amount of hydrocarbons, and CO2 would I think remain the same.