Gasoline doesn't burn with smoke, right?
why do you think there is an exhaust pipe on a car. with every action there is a reaction and if you burn something there is gonna be a product that comes from it when you do so
You don't see smoke normally if gasoline is burned efficiently but it does release carbon and other emissions
If burned with high enough heat. All things burned will emit a product from the combustion of fuels, it's splits the fuels into it's basic elements of solids, liquids, and gas .
Why don't you go and find out