The small petrol engine/MPG argy bargy reminds me of the test Top Gear did years ago.
Clarkson wanted to prove a V8 M3 was more eco than some basic 1l engined hatchback, quite possibly a Dacia, I don’t remember.
That was a Prius which has a CVT so driven hard is at the top of it’s rev range constantly, plus it’s a 1.8 so hardly comparable to a 1.0L 3-cyl petrol engine. Anyway, who in their right mind drives flat out constantly.
fuel economy at higher speeds will largely be dictated by wind resistance and I guess the frontal area of this car is quite large
Try explaining that to all the thick-necked coked up dickheads rumbling round in Range Rover Sports.