If my maths is right, that car you mention would use around 2.6 times more fuel than the one in the video. Not such a great saving - but maybe they are different cars. Or my maths is (probably) wrong.
Edit: this 2017 model on Trademe gives a fuel economy listing of 3.8l/100kms, which would roughly work out to just under a litre per 25kms. So I wonder how they worked it out in the video then.
https://www.trademe.co.nz/a/motors/cars/nissan/note/listing/3663052160