Well I understand someone not wanting to get there machine shutdown, and to the guy from NC, that style is really not possible in mass unfortunately. The trick in these situations is to find some common ground with the owner of the shop or gas station. Or start networking...a friend of a friend, ask for a favor, work all the social angles before you start ripping your truck apart just to get a sticker. One day I just strolled into a tranny shop in waltham, started talking to the guy about trucks and stuff bc I knew my transfer case needed to be resealed at some point. I would go over to just "hang out" at the shop after a couple of times, they knew me by first name, and we had a friendly relationship. couple months later my tranny blows up, got it done FOR COST from this guy...just from working the "hey you know me" angle. I also called in a favor from a friend who knew the guy who owns roxbury auto body...got my floors replaced FOR COST. Sure when I picked up my truck there were beer cans scattered all over it, and he wouldn't stop bitching about how he was "losing his ass over it" but you know what? never had to see him again, and it got done. And when I moved out to CO, first thing I did was go talk with some local mechanics, found out who was the best, and made friends with them, the guy at boulder muffler and alignment will throw my truck up on the lift any time I ask about my exhuast, just because I have a relationship with him that's friendly, havne't given him any business YET, but he knows I will.
Moral of the story?
Make friends, it pays.