Price of gasoline does not seem to correlate with demand.
Looking at the adjacent graph we conclude that the price of gasoline in the US has little correlation with the demand. In fact either on May 2009 and again early 2015 when the price of gasoline bottomed in the US, the consumption of gasoline either stayed the same or was lowered by a little. Additionally in the run from 2001 to 2008 –when the price topped at $4 per gallon the consumption increased from about 9000 bpd to 9500 bpd. On the summit of Sept 2008 the priced plummeted to $1.75 and the demand maintained a negative slope. This was probably caused by a diminishing buying power – but also likely by the advent of more efficient vehicles.