We drive less, but gas keeps going up? I smell a Rat

According a CNN article, the Department of Transportation, figures for MARCH.. that is MARCH, not April or May... but MARCH, we saw the steepest decline in driving in the US ever recorded. We drove nearly 11 Billion (thats a B) miles less in March of this year than last year, a 4.3 percent decrease, yet gas prices continued to rise over that period, and fuel stockpiles decreased.

Can someone explain what the heck is going on here? Last time I took an economics class, decreasing demand was supposed to mean increasing supply, not the inverse. And decreasing demand, should be leading to decreasing prices, not the inverse.

I'm begining to smell a rat in the barnyard here folks.