Bugatti Chiron and WW2 Spitfire
Watched Top Gear with the new Bugatti which has 1500hp, and remembered that the Spitfire Merlin engine also produced this with a supercharged 27L V12, or 55bhp/L. State of the art 70yrs ago, the Bugatti has 187bhp/L. So, the Bugatti has 3.4x more bhp/L
Therefore in 70yrs time the Bugatti will have 5100hp from the same 8L engine.
Or will it. If a Eurofighter produces 90kN of thrust, in 70yrs time a Bugatti will have approx 50,000hp