Data shows oil sands reserves from 68 US-listed companies dropped by about 7.7 billion barrels.
Less consumption, more production and alternatives are making the country more energy self-reliant.
Research reveals 98% of Canadian energy production is exported to the US.
EPA says fewer gallons of ethanol are necessary because the fuel efficiency of cars has improved more quickly than expected.
US Energy report cites a boost of coal consumption for electricity.