Price of gas in San Diego... on Coronado Island (just the 2 gas stations, no others I know of) This year vs last year


For perspective, this next one is from last Memorial Day (May 2007):
http://justacarguy.blogspot.com/2007/05/price-on-coronado-island-in-middle-of.html#links
I bet they have no explanation (that will make sense) why
the cheap stuff is up 40 cents, but
the expensive stuff is up only 20 cents.