Depends on the details of your mistake, and what your car needs.
If you car is built for low-octane gas, then it will run quite happily(but at higher cost) on higher octane gasoline.
If it's built for high-octane and you put low-octane in, the engine may knock and/or ping, which isn't entirely healthy for it.
If yoy put diesel in a gasoline car, or the other way around, it won't run at all.
It continues to burn gas. I imagine if you added gas slow enough it would just never fill up.
Nothing happens, except your wallet will be lighter.
The engine may not start and/or have poor performance. Drain gas tank and fill with proper fuel.
because your car has a gas leak
No
you will be ok MIGHT notice a very s;ight decrease in performance
probably not you have a gas line leak
Miles divided by gallons of gas put in your car. I reset my odometer every time I fill up my car. That way, next time you would fill up your car, you take the miles that are on it and divide it by how many gallons of gas it takes to fill your car up.
Get out and look
No it cann't unless the hole is bloked.
No
Yes