The environment is spooky, and the build-up is done well. I think the ending would have been better if it wasn't so abrupt and unrelated to what was going on. Like if the running man came out of the gas station (or from out behind it, or out of the forest) as you're driving away and then you see him in the rearview chasing after you or something, THAT would freak me out.
Solid execution with a lot of potential. Nicely done!