It's an interesting test. There were comments made about the Nissan being a problem child with tank vapour locking requiring the vehicle to be shaken to allow complete filling. Whether or not that is the case, I wouldn't know.
Big petrol engines that don't need to work hard being fuel frugal isn't really a new concept. The issue is that most of us ending up driving vehicles "to capacity" so while they can return good numbers, in practice unless you drive like Miss Daisy, it's not always the case. Most of us also don't leave vehicles as stock which can also have what seems like a ridiculous bearing on fuel use. Even between "like" vehicles the numbers are fuzzy. I drive a 200. My run to work is 35k's of a mixture of traffic conditions. Scangauge figures can vary anything up to 2L/hundred over the same route with ease. Some on the 200 owners forum however scoff when told of the numbers that others achieve. For my commute, I'm averaging about 12.8 litres to the hundred - both on the gauge and at the bowser. Others are using 16 on the highway - I run 10.5 - 11. Towing a 2+ tonne boat used to be about 17-18. Since the cabin mods however it's up about a litre per hundred - at a guess due to windage. Petrols also seem to be a mixed bag. Some tell you they are so close to diesel that the extra cost for a diesel isn't worth it. Then another lets it slip they get 600 out of a tank at best. Who do you believe? Is it driving style? Is it vehicle set up? Is it bullshit? Who knows. Here's another head to head review with drastically different results https://performancedrive.com.au/2019...on-video-1700/
My experience of the Nissan is limited to the old bloke that lives behind me. He bought one to tow his van and flicked it within 10 thousand k's. When asked about it, it came down to fuel cost and three trips to the dealer in that time for fault rectifications. Didn't have a good word to say about it. That was pretty much where my investigation stopped. Given the test here, they would warrant a look when the next car is being looked for but not without some serious investigation.