Gasoline will kill weeds if that's all you have to kill weeds.
Spraying a bit of gasoline on some weeds is okay but don't dump a bunch of gasoline on the ground or weeds because the gasoline can get into the water supply and then cause issues.
It could be illegal in some places to kill weeds with gasoline if you're pouring a bunch of it on the ground but it's very unlikely that anyone would catch you.
I've used gasoline to kill weeds before and it does work.
However you can also use vinegar, salt and some dawn dish soap and mix it together in a sprayer and spray the weeds with it and it will naturally kill the weeds without harming the environment.
Or you can also spray the weeds with some bleach and that will help as well.