Study: Motorists in Washington, Oregon and Idaho residents used on average nearly a gallon less each week in 2007 (7.8 gallons) than they did in 1999 (8.7 gallons), the lowest per-capita level since 1966. seattlepi.com
Less consumption = less demand = lower price
However, even if the US reduces consumption, the rest of the word particularly China and India and growing rapidly and as we teach them to consume our energy hungry goods the demand increases.
less consumption = less demand = lower price = increased consumption
the beauty of the free market; lack of demand inevitably creates demand; adam & eve.