The guy at the Chevron Extra mile likes when I had him 21.38 when my bill is 11.38 instead of him having to count change for a 20, he can just give me a ten back. I've had kids at other places hand me back the extra money and start making change from the 20. I tried to explain it to them, but since they had already typed 20.00 into their register, they would have had no idea how much change to give me. It even tells them on the screen how many of each bill or coin to give back.