[Jim Noble]

I’ve always been taught in various CCW or tactical classes that you CAN’T employ deadly force against a thief who is moving away.

Now, if you’re standing in front of the car while he’s driving off in it, you may have other options.

[Desron13]

"I’ve always been taught in various CCW or tactical classes that you CAN’T employ deadly force against a thief who is moving away."

It varies state to state. In Texas you can use deadly force to protect property as well. At least that was the case as of a few years back. I am not aware of any change on that count.