I worked as a cashier in my family's gas station for a few years. I ended up doing contract development work for a retail petroleum distributor about 15 years later.

A couple of these that I can think of:

- The temperatures in our underground storage tanks were very stable, varying only by a couple of degrees F irrespective of the air temperature.

- Fuel almost always arrives warmer than the underground temperature, so you see contraction of volume on your tank monitor as newly-dropped fuel cools.

- Gross volume is the amount dispensed into the distributor's transport trucks. Net volume is the amount dropped into the Customer's tank. Gross vs. Net and temperature adjustment factors are a place where distributors play around to eke out some margin. I wrote some code that took into account air temperature at the terminal (the "rack") where trucks were filled, along with historical rack temperatures, to produce temperature-adjusted normalized costs. When you're making fractions of a cent per gallon margin every little bit helps.