Here's something counter intuitive.
Fuel flow rate has directly relationship with throttle body opening, which influence airflow rate/volume. Raise of Engine rpm is the result of increase airflow, and ECU inject more fuel due to more air to maintain close to 14.7:1 ratio

That's why on race series like GT3, TCR, WTCR, BTCC racing etc that don't get standard engine design like F1, everyone get air restrictor (essentially a plastic cone, or metal plate with standard diameter) for balance of performance.

Just ignore the coasting scenario here for a bit. Let's assume the driver is stepping on throttle.

The intention is to tell people engine rpm only has indirect relationship with fuel consumption, not direct relationship.

We have no control on engine rpm. We only control amount of air when we step on throttle. The corresponded fuel is base on the air, and engine rpm is the effect.

The reference to race car is to show with air restrictor, on ball park, that is the max amount of air everyone get. Try to put bigger turbo or whatever, the max performance can't deviate far from the average. Air is the key to to fuel consumption, engine speed is the result.

That's true!!! Bloody bastard electronic throttle.

Now 200hp+ is entry level, 600hp+ family saloon is not abnormal. Without those electronic assist most of the modern car are probably un-drivable, at least not for normal driver.

noob