Looking around at WS pump prices for our now-weekly update, we reflected a bit on what was happening when we started WSGPW with this post three months ago — prices were skyrocketing. The highest posted price for unleaded in WS peaked in mid-May, when two stations sold it for $3.49. Tonight, one of those stations, 35th/Holden Chevron, is fifty cents lower (left photo); the lowest posted price in WS tonight is at Delridge Arco, $2.83 (right photo), down 54 cents from its May 11 peak. If you’re interested in the whys and wherefores, this article tries to explain what’s been going on in the gasoline industry.