I respectfully disagree. Audi went fron 12 cylinder to 6 cylinders for their Diesel sLeMans eries dominating cars.
The cars reach 200 mph, like F1 cars.
A 4 cylinder turbo F1 car can reach horsepower and speed of current V8s, as well.
The drivers, fans and owners are not clammoring for faster cars.
I like the idea of auto racing as a lab for improved technology on all fronts; fuel economy, safety, new technologies.
Audi TDI came first last year, followed by Audi TDI+hybrid in second.
Those technologies transfer over directly to VW/Audi’s consumer product lines.
and as to technology, safety is fine, the only reason i care about fuel consumption is in regard to whether the rules say you can refuel or not for pit crew safety, racing is racing and at the pinnacle of racing, fuel consumption should NOT be a factor... leave that to the other formulas
but then again, that's just me... i never heard of NHRA or NASA worrying about fuel consumption