Hello, noxman -
I have not made any videos, but have recorded fuel consumption on a level road at various speeds in cars with a 1.0L and 1.8L gasoline engines and manual transmissions.
See
http://ecomodder.com/forum/showthrea...atic-6710.html
and
Speed kills: testing MPH vs. MPG in top gear - MetroMPG.com
These were both done on level roads. Readings were not "instant", but averages taken over a distance > 1km, and then repeated in the return direction.
Other EcoModder members have done similar runs with other vehicles.