If you use gasoline of any grade in a gasoline powered mower, it will be fine. I often use mixed gas for my 2 stroke chain saw in my 4 stroke mower with no ill effects other than some additional smoke and smell.
If you put diesel in a gasoline mower, that is bad and could ruin the engine
If you put gas in a diesel mower you will immediately ruin the high pressure injection system.
Engine wear and damage can occur.
If all oil the mower will not start. If only a little oil, the mower may start but run rough and smoke very much.
Don't run it. remove the cup that the gas sits in using a wrench. soak in regular unleaded gas for a little while 30 minutes & reassemble carb cup & bolt it up to the mower.... check youtube/mower carb cleaning.
Nothing happens, except your wallet will be lighter.
drain it
you will be ok MIGHT notice a very s;ight decrease in performance
white smoke comes out when you use wrong gAS, Like if itsays only UNLEADED and you put diesel,,then you will see white clouds.
If you overfill the Gas Tank just make sure to wait until the gas that spilled evaporates before anything else. It just takes a couple of minutes.
why/how do you think you put it on wrong?
donno
This question makes no sense, gas is gas, regardless of where it comes from.
Is this even a real question? Seriously, man. What does your mower run on? Hopes and dreams?