I was looking for a figure on US Oil demand and found this 2013 article (see below) which had a nice breakdown of why demand has been shrinking. Looking at some of the charts in the article, it is amazing they were able to prop it up to a $100 a barrel as long as they did, never underestimate the power of QE funded Wall St. speculation on commodities.
http://ourfiniteworld.com/2013/01/31/why-is-us-oil-consumption-lower-better-gasoline-mileage/
Better up to date source.
That decline stopped a few years ago.
http://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=MTTUPUS2&f=M
And for refined only products:
http://www.eia.gov/dnav/pet/hist/LeafHandler.ashx?n=PET&s=MTPUPUS2&f=M