I've had similar experiences with Alamo and am equally in love with them.... they just have their system down. The prices are consistently the lowest when I go through Costco and the whole, "Skip the Counter" thing is amazing. They've also comped small amounts of gas before and comped me $50 once when I told them a tire was low and I had to stop to fill it. I honestly wasn't expecting anything but just wanted to let them know they had a slow leak so the next guy didn't get stuck with it.