Help me out with this one, if you can.
Our car has a slow leak in my right front tire. It get about seven pounds low every three days or so, and it has not been convenient for me to spend the time to go to the dealer and have the thing plugged. For several months now I have just filled the tire at the closest filling station, which has two air pumps (one is perpetually broken) that require six quarters to start the air coming.
About a week ago, both of the air dispensers—including the busted one— began sporting signs announcing that air would now be $2.00 for five minutes rather than $1.50. At the time, that caused me additional annoyance since I only had six quarters, and had to get change at the 7-11 to acquire the additional fifty cents. But when I put in the coins, the air turned on after only six quarters, as it always had. I finished filling the tire in about a minute, wasting the other four minutes of potential air, assuming the change in price had just occurred and the owner hadn’t yet adjusted the machine. But today when I went to fill up the once-again underinflated tire, it still only took $1.50 to start the air flowing.
The question: Am I ethically obligated to inform the owner of this? Do I owe him a buck for the last two air purchases?