http://www.democraticunderground.com/discuss/duboard.php?az=view_all&address=364x2031161 My comment on why was as follows:
Traditionally Gas prices peak around Memorial day, and then decline slowly all summer long. The reason for this is in April the refiners switch from making fuel oil to making gasoline, but Gasoline is generally in short supply as people drive more do to the warmer weather till about Memorial day. Gasoline is produced all summer then about September the makers switch back to making Fuel oil for the coming winter.
Now, Gasoline and Fuel oil is produced at the same time in the same process, but the refiners can switch, to a degree only, between the two. The key is WHAT is the primary AIM of the production, Gasoline or Fuel oil? You always produce BOTH, but which one do hyou want MORE of out of a barrel of oil? In winter it is Fuel oil, in Summer Gasoline. Given the different demands, you always have a surplus of one or the other during the time period just before the changeover.
Thus we are at the time of the year when Gasoline should be at its LOWEST price. People vacation plans are done and people will be driving less than in the Summer Months, but production of Fuel Oil has not yet begun. This is complicated by the effect of HIGH PRICES. One of the affects is people driving less (or otherwise using LESS Gasoline). Thus you had people who canceled trips do to high Gasoline prices, people who bicycled to work do to high gasoline prices, and even people who took Mass transit do to high Gasoline prices (and people who traded in low mileage cars for high Mileage cars). All of these groups would be buying less gasoline causing a drop in demand and with less demand for Gasoline comes downward pressure as to prices.
BOTH of the above (i.e. excessive stocks do to 1. production in favor of Gasoline over fuel oil and 2. drop in demand do to people using less gasoline) may explain the dropping prices of Gasoline. Oil prices, by the Barrel, is still staying above $70 a Barrel, the price it has been for months. My guess is that the oil Companies produced to much Gasoline during the Summer (Do to a drop in DEMAND do to the high price of Gasoline) and the refiners now are pushing gasoline onto any retailer who wants it (More to free holding tanks for Fuel oil that is being made now for use this winter).
The above is enough to explain the drop in Gasoline prices. Now it is possible that someone in the Government is selling gasoline to keep the price low, that would ADD to the pressure for the price to drop, but the Government emergency fuel reserve is NOT refined oil (Through some is gasoline, Diesel Fuel and Fuel oil), but mostly unrefined oil. Thus selling the oil reserve would reduce oil prices generally, not just gasoline (and the present drop seems to be lead by Gasoline, not general drop in the price for oil products). Is it possible that the price of Gasoline being manipulated for the election? yes, but unlikely, seems more to do with more normal causation.