I've done a number of all types of gas station shops. The MS only are easy, but I rarely do them at $8. I do ghetto well, so I get the MF ones at $16 plus 5. And a short drive away. I do country ones at the same rate. The hardest part of the revealed audit are the pump displays. All elements must be there and MF's instructions has an easy cheat sheet for the 10 photos, but you have to check to see if you need a photo for an issue. I usually take photos of all pumps.
They do night time shops with these as well. Make sure to catch the logo on the canopy, even with the two photo shops. I had to return because there was no logo showing on my overall picture. It was fun trying to get a side shot with the configuration of the gas station to its environment. Also make sure you have a good low light camera for night shops.
Fun things: one shop I was ending the MS portion when one guy illegally parking in the fire lane got into it with someone else illegally parked in said fire lane because she was parked in front of the door. Then there were the seven police cars with two vehicles parked in the lot whose occupants were being arrested. AT night. I had a fun time capturing the required sign and overall picture photos. And the station had the brightest flood lights I've encountered.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230