.......The bad news is you may be 7 or 8 hours into the trip when you hit the no go mark and have to turn around and fly another 5 or 6 hours back.......
That's the optimistic view - what happens when you are WAY beyond your PNR - at which point everything was on plan - and now have no option but to continue into unforecast increasing headwind.
Splash.
Never had to do it, only ever flown that route at 35,000 +ft or so with 4 engines and more fuel than one could possibly need, i.e. flt. plan plus diversion plus 10% plus a bit for Mum - just in case.
Way to go.
The only time one has too much fuel is when one is on fire.
Not that he had any choice of course, he would doubtless have tanked up to the maximum.
I've just sold a final 10 litres of Avgas to a guy setting off from Northern New Zealand to Norfolk Island (part way to Oz. ) he insisted on absolutely full tanks to the last drop.
I knew another guy who flew up to the very top of NZ, illegally landed in a field and stashed away a couple of cans of fuel under the hedge, then flew back to the Customs airfield of departure for the night, some 45 minutes away. Next morning he cleared Customs, flew to his field again and topped off his tanks with his stash before also setting off across the Tasman to Aus.
But that's another story !