NavList:

But it is not clear, since this is a planning document for airports to use, whether this is with all fuel in the plane consumed or with the fuel needed for required reserves not considered. In the U.S. a 45 minute reserve, in addition to fuel to reach an alternate, is required. It makes sense that these graphs used less fuel than all on board since you would not  plan a flight to a destination that resulted with zero fuel left on board. Using the minimum of a 45 minute reserve means that flight 370 could have flown an additional 363 NM at a .84 mach cruise speed.

For oceanic operations, U.S. regulations require a even larger reserve.

"§121.645   Fuel supply: Turbine-engine powered airplanes, other than turbo propeller: Flag and supplemental operations...

(b) For any certificate holder conducting flag or supplemental operations outside the 48 contiguous United States and the District of Columbia, unless authorized by the Administrator in the operations specifications, no person may release for flight or takeoff a turbine-engine powered airplane (other than a turbo-propeller powered airplane) unless, considering wind and other weather conditions expected, it has enough fuel—

(1) To fly to and land at the airport to which it is released;

(2) After that, to fly for a period of 10 percent of the total time required to fly from the airport of departure to, and land at, the airport to which it was released;

(3) After that, to fly to and land at the most distant alternate airport specified in the flight release, if an alternate is required; and

(4) After that, to fly for 30 minutes at holding speed at 1,500 feet above the alternate airport (or the destination airport if no alternate is required) under standard temperature conditions. "

I don't believe that other countries or the ICAO regulations are less stringent.
gl