Nonsense. My Jaguar XK8 is in sixth gear turning 2100 RPM at 90 MPH. It is in fifth gear turning 2800 RPM at 55. That's a simple matter of gearing and physics. My instantaneous fuel economy at 70 MPH on flat ground is around 35 MPG. At 55 it is around 26 MPG.
In any case it is none of anyone's business how I use the fuel I buy. It is, however, everyone's business when some idiot is acting like they are the only person on the road that we all paid for.
Greetings, fellow steel cat owner. :)
And thanks for reinforcing the point that I’ve been making.
Your engine is optimized for 70mph. At 140, you will notice increased fuel consumption due to drag. By the way, just what do you think limits your speed? It is simple: AIR RESISTANCE. Once you reach a certain point, your car will not be able to go faster. This is entirely an issue of air drag, mechanical friction, and vibration. The horsepower of the engine simply cannot overcome these sources of friction. The thrust of your engine exactly matches the combined affect of drag and friction.
Jets go faster because they have much higher horsepower ratings, all to overcome air drag.
Physics is just the way things work.