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The guy tests 2 cars on both the engine and chassis dyno

https://youtu.be/z2FdtRb94hw

Skip towards the end of the video. His math is a bit wonky, but it just proves that transmission losses aren’t a straight percentage.

This guy has more waffle than my supermarket freezer. Get to the point man !
The reality check is this:-
Irrespective of how you obtain a power figure, it is only meaningful if you know how well that power is going to propel the mass of what is sitting on the wheels. Of all the dyno figures that represent real road values, it is the in floor chassis dyno driven by the wheels. If the car under test is tied down correctly it will still produce a less than perfect friction to drive the rollers. This is exactly what your tyres do when the rubber meets the road. It also factors in your transmission losses so this is the power figure that you should take most heed of.

The only use for an engine dyno is for engine development so as to eliminate all the potential variables.

MD you're back!!! Did you participate in the record breaking event involving lots of Santas and jet-skis?

Hahha. Mate, take this advice. Never sit on Santa's knee. Soon as you do, they'll want to put their hand up your shirt in the guise of practicing ventriloquism but it never ends there.

It's coming up to Christmas, be good to your mum.

A glimpse into yesteryear's tar burning lighting dyno...

Hey I remember those, sucks up horsepower. Brown pants moment when you’re trying to get away from a dog with rabies at 10pm but need the light at the same time,