I've learned my lesson on

I've learned my lesson on car rental. I didn't ask for gas service because I'd planned to stop at a gas station on my way back to the airport. Of course I was running a bit late, so I didn't stop for gas. I needed half a tank, which would cost me $15 normally, so I figured it couldn't be more than $30 to pay Avis to do it. In retrospect, I had time to stop for gas but I didn't know it then.

Turns out they charge per mile if you don't drive more than 400 miles. 150 miles times 31.5 cents per mile = $50.

Stupid me. Bastard Avis.