Gasoline prices did drop momentarily, as you note, down to $1.61 (I think I paid $1.49 at one point). We know how to do it — crash the world economy. Not sure that’s a good idea now.
Oil prices have to come down significantly to get to $2 gasoline. We could produce everything we know about in the U.S., and wouldn’t get $2 gasoline. In fact, if oil prices were low enough to get $2 gasoline, it wouldn’t be economically feasable to produce new oil in this country. Certainly not mile-deep deepwater wells in the gulf, or shale oil conversions in the midwest.
THe only way I can think of to get to $2 gasoline is if I take all my money and invest it in oil companies. Last time I invested in an oil stock, the price dropped to 95 cents. :-)