$75

In case you're wondering about the maximum amount of gas that you can put it an automobile in one fillup, it appears to be $75. 

I discoverd this handy tidbit while driving a U-haul truck from Northern California to San Diego.  The first time I went to fill up the truck, I just turned on the pump and got back in the truck while it filled the tank. I really didn't want to look while the tally climbed into the hundreds.   Eventually, I heard the click, removed the pump, and resumed my journey south.  That's when I noticed the gauge was not sitting on "F".  I was afraid there was something wrong with the gauge until I pulled in for my next fillup.  This time I paid attention and as the total price neared $75, the pump began stopping. Then I noticed a small sign on the pump that said "In an effort to keep the cost of gas low (yes it really said that!!) we have limited each purchase to $75.  Feel free to begin a second transaction if you exceed that amount."

I am dying to know how the $75 cutoff saves them money.  All that know is that I had to load up 3 times at the $75 limit plus one more $60 fillup to reach my destination.  I don't know how those truckers do it.