The model, the oldest in the Boeing 777 family, has a range of 5,240 nautical miles (9,700 kilometres), according to the Boeing website. Its typical cruising speed at 35,000 feet is Mach 0.84.
Ya gotta consider if this aircraft was flying below radar, it was guzzling Jet A like there was no tomorrow. Its range will be nowhere near 5,000 miles under the condition of low altitude flight.
I only fly the little stuff. If there's a pilot around who flies the fanjet stuff, can he comment on a possible maximum range at low altitudes?