Possible Clues:

• Engineer vets car on site where one's been brought in – here?
• It caters for visits re octane
• Sensitive actor could be filling up at this point
• Avionics tester deployed source of fuel
• Place to get some air
• Forces army into changing fuel supplier
• Position of cross after Mass, say, where one stops in transport?
• Terribly sensitive actor, during long run, refuelling here?