We also sell refined products to countries that have a very high demand and do not have adequate refinery capacity themselves. That is why the price is going up when our actual national consumption is down. (Supply and Demand)
There was a recent surplus if distilled products left over from the last glut, which is why the actual price of crude was going up but Gas prices stayed low and even dropped. Now that the inventory has been sold and moved, prices are equalizing more in line with the volume and price of crude.
That has changed more in the last year or two. Take a look at the following breakdown of petroleum exported over 6 months.
http://www.eia.gov/dnav/pet/pet_move_exp_dc_NUS-Z00_mbblpd_m.htm
Ultra-Low Sulfur Diesel and Conventional Finished Motor Gasoline now exceed the volumes we ship out for residual oil and petroleum coke. We finally have a bit of excess refinery capacity again and it is helping our trade balance. Crude oil imported in, more expensive refined products shipped out.