SOLUTION TO PREVIOUS QUESTION?
From Vicki in Naples - "the state of Florida is currently (though the month of August) on a "gas tax holiday." This lowers the cost of gas about 8 cents per gallon. Brought to you by the Shrub, no doubt. Drink up!"
This doesn't explain it all - add 8 cents and we're still well below the previous peak - but it's a start.