Limited ammo or guns? Not a problem in my house.
I would be able to survive for quite awhile when it comes to food,ammo,and fuel that I keep stockpiled.
I feel it would take less than 6 weeks before a person is going to have to take human lives to protect what is theirs.
The biggest decision is who are you willing to shoot to protect your supplies. When your good friend or neighbor comes to ask for help and you tell them no how far you willing to go to stop them.

As far as vehicles most vehicles not running during an EMP will not be affected. Depending on year of vehicle a majority of them will restart after an EMP but may have some minor electronic glitches. But no power means no fuel for your vehicle or generator.

Those of us that live up north will have to be more concerned about keeping warm in the winter if we decided to stay at our homes or if we will head south with most of the other sheep. I will be staying up north for the fact that less population to deal with as the rest move south or freeze to death.

I feel that there will three types of people when it hits the fan and society collapses, sheep, Shepherds and Wolves.
Most people will definitely fall into the sheep category.