It also makes the person very a vulnerable target escpecially while holding the pump and even if walking to/from store his direction is predictible.
The shooters do seem to favor gas stations. There could be a lot of reasons for that. They also favor stationary targets out in the open - sitting, standing, etc.
One thing you might try while filling your gas tank is setting the clamp on the nozzle (so you don't have to stand there outside your car holding it) and either then walking around or getting back in the car and shutting the door. Targets have been out in the open, near a street, relatively stationary, and sometimes occupied with a task (don't wash your windows or check your oil - do that at home; also, be careful about waiting on the street for a bus or ride; try to stay with a moving crowd since the shooters seem to be looking for isolated targets).
Your car isn't bulletproof but the shooters seem to be looking for sure kills and no one enclosed in a vehicle has been shot yet (maybe there's a problem with .223 ballistics going through glass or metal). Fortunately in this case the victim was reported to still be alive and was taken to the hospital.