Yes, you're absolutely right and I agree with your comments. However, from a holistic view, it can never be justified. the difference in bhp from "normal" fuel to V-Power or Momentum (on a car designed to run on 95RON) is not worth the extra money. You'll certainly not pay for itself in terms of efficiencies and mileage and other than placebo effect, you'll not notice the difference. If you're on the clock, tracking your car then yeah - use Momentum. If you're not then just use a half-decent, branded 95RON fuel