RR P38, 4.6.  This has happened twice now, and has got me wondering:

When running on an almost empty tank (but with some left according to the
fuel gauge), the engine has started to lose power.  The more I put my foot
down, the slower it goes, but if I ease off to a light throttle it seems to
drive as normal.  Putting petrol in cures the problem.  So far, so normal -
running out of petrol, been there, done that.  However...

When I have run out of petrol in other vehicles, the engine has lost power,
started to splutter and kangaroo, and then stopped within a few hundred
metres.  In both cases with the RR, the loss of power has been gradual and
predictable (i.e. no spluttering), and I have been able to travel several
miles before stopping to fill up - although at low throttle openings and
moderate speeds.  It's almost as if cylinders are cutting out one by one as
the fuel gets lower.

Typical of the RR - it even runs out of fuel in a civilised way!  In both
cases it was reassuring - once was on a fast unlit A-road after dark, towing
the Series on a trailer, and once was on a motorway in between service
areas - as it gave me enough time to get to a safe place to refuel.

Is this a cunning plot by LR to avoid sh*gging the catalysers, a feature of
modern fuel injection systems, or just "one of those things"?  The fuel
gauge was replaced under warranty less than a year ago, but it must be
faulty at the bottom end, as it was not reading empty, although from the
amount it took to fill it, it had only 5 or 6 litres left on each occasion.
Most gauges would be reading empty long before that.

Any thoughts?