The factory recommendations are not always the maximum theoretical distance you can get from your cars, those recommendations are based on real world usage, e.g. 120 km/h on a highway or 30km/h average with stops in the city center.

It is called "hypermiling", you can do that with gas cars as well, by driving on a level road, minimal breaking and accelerating, plus driving in the engine's optimal RPM period in the highest gear possible. In short, the ideal conditions for the car.

The arricle says it was a production spec Nexo, it was just being driven for maximum efficiency. As the driver says “it’s actually possible to go way beyond Nexo’s official range”.

Tesla record is over 1000 km, so at this point I'm not sure why anyone is interested in hydrogen for personal vehicles over electric.

We were getting 1000km between fill ups (60L tank) on a family road trip in a bog standard 1.8L gasoline (!) Ford Mondeo, seating 2 adults 2 kids and with trunk loaded to the brim and A/C running on full.

Really difficult to be excited or impressed by these "records". Both Tesla and H2

Filling my Mondeo tank costs me about 70+€. Recharging a Tesla at home costs 1 or 2€.

The record is not the autonomy by itself, but is about getting the same autonomy for 35-70x less money and potentially 0Co2e emission.

A full charge for 15$ versus how much for fuel? And do you pollute?

The storage problem:

You can make hydrogen from solar panels and store it until you need a refill vs. to charge your Tesla with solar, you'll need to surrender it in the middle of the day and wait for a full charge.

It says in the article that it consumed 6.27 kg of hydrogen and the standard tank is 6.3 so I would say that it was not modified.

Down hill with a trailing wind going very slowly without breaking? Still 664km is impressive!

Maybe a good driver who drove economically