Lileks gets gasoline pricing, will politicians and voters?

I’ve been watching the price of gas drop all weekend. It seems like it’s adjusted on the hour. I’ll never understand how a load of gas the station bought at a higher price last week can sell for less today. I mean, I can understand why they'd charge more for gas they bought last week at a lower price - they're evil and bad. But this charging less for something they bought at a higher price - it makes no sense. Sure, blame it on "economics" or something, give me that ridiculous explanation about how you're actually paying the replacement cost of the next load (yeah, right, that sounds logical) but it’s obvious they’re ungouging us. Well, I’m tired of being unjerked around by these guys. I want the pumps to show what they paid for the load I’m putting in my car, just so I know how many pennies they’re not getting.