If you mean mix it with another substance such as oil then it better be for a weed wacker! A typical car runs on straight 88 octane gasoline! Nothing else is suppose to go into the cars fuel tank unless its an approved additive for better mpg and/or other performance gains! If anything else is mixed into gasoline and poured into a cars engine the car will discontinue running! Or start sputtering, ticking, pinging etc!
Some older cars 70s back used leaded fuels and some now require a lead additive due to all street fuels being unleaded but that's for some classic cars only!
Adding a small amount of mixed gas and oil, like used in a string trimmer, will not hurt a vehicle. The car might smoke slightly until the mix is burned through.
It's a possibility that your car may not start correctly.
many things can happen
mix mealtl and gas
what happens when you mix bleach and muriatic acid
You have a mess.
it makes bubbles
nothing
You produce a lot of gas (CO2).
You'll ruin the engine.
When they mix, they form an oxygen gas.
Nothing because krypton is an inert/noble gas.