If we aren't refining it, then someone else is, and importing it here (adding to the costs). I doubt any serious person can allege that we are using half as much gas as we did in 1985.
(Hopefully someone else can post the chart. It's embedded and interactive, and I can't figure out how to post it here.)
That number has been meaningless to almost everyone for a very long time. Refineries primarily make gasoline blending product that is mixed and then sold by another company. Very little product is sold directly by the refinery to the end users.
For example, your link shows 30.5 million GALLONS per day sold in September. In September, the entire US sold 8.575 millon BARRELS of gasoline or over 360 million GALLONS. Your link is to only 1/12th of the US sales.
U.S. Product Supplied of Finished Motor Gasoline
While there has been a drop in demand, it is not as significant as the Refiner Sales would indicate.