Yes, there is a massive reserve in the U.S.
Take a look at the Department of Energy web page, but I'll post some salient points.
www.fossil.energy.gov...

The U.S. Strategic Petroleum Reserve is the largest stockpile of government-owned emergency crude oil in the world. Established in the aftermath
of the 1973-74 oil embargo, the SPR provides the President with a powerful response option should a disruption in commercial oil supplies threaten the
U.S. economy. It also allows the United States to meet part of its International Energy Agency obligation to maintain emergency oil stocks, and it
provides a national defense fuel reserve.
The Energy Policy Act of 2005 directed the Secretary of Energy to fill the SPR to its authorized one billion barrel capacity. This required the
Department of Energy to complete proceedings to select sites necessary to expand the SPR to one billion barrels.

The Northeast Home Heating Oil Reserve is a 2-million barrel supply of emergency fuel oil for homes and businesses in the northeastern United
States. Established in 2000, the Heating Oil Reserve is an "emergency buffer" that can supplement commercial fuel supplies should the heavily
oil-dependent region be hit by a severe heating oil supply disruption. Since its creation, the Heating Oil Reserve has not been used, but 35,000
barrels were sold during 2007 for budgetary reasons. The Government will use the proceeds from the sale to repurchase a quantity of heating oil in
the future.
You also have to consider the considerable amount of oil and fuel that is in the system. Either on tankers, in storage tanks at refiners, in
pipelines, being processed, fuel already delivered and stored by private industry, etc....
The U.S. also has agreements in place with friendly nations like Canada to keep oil flowing into the country if the proverbial poop hits the fan, and
U.S. production could also be ramped up in a crisis.
Americans could also go into severe conservation mode in an emergency.
I don't have a figure on U.S. consumption, but they certainly have a reserve and the ability to draw out the supplies they have on hand.