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Well, my car is conventional, burns unleaded gasoline only, it is unmodified, in EXCELLENT condition. I'm afraid it's a little too old for your test, though. Even so, I'd gladly take you up on your challenge, if I had time to travel to NC. You should be able to find SOMEONE in NC to take you up on a similar challenge though. My car is hardly unusual. There are probably several vehicles in your neighborhood alone that see similar increases in fuel economy at slightly higher (but still normal) highway speeds, compared to slightly lower (but still normal) highway speeds. This increase in fuel economy at slightly higher RPMs has nothing do do with me, personally, and it has nothing to do with the specific car that I drive. My car is just one example of millions of cars, by every major manufacturer, that can and DOES achieve similar results, due to the way that the various engines are designed. I am not the only person who has noticed this increase in fuel economy at slightly higher highway speeds.
I propose the following counter-bet:
Why don't you try it with YOUR OWN car? If you aren't so hell-bent on proving me wrong that you ignore what you observe with your own eyes, you might get the shock of your life. If so, don't feel bad. As I posted before, it is counter-intuitive to think that a vehicle travelling faster might be using less fuel. So I don't blame you for arguing so hard against the concept. What do you win? Well, you just MIGHT join the ranks of many drivers who KNOW that their car can get better fuel economy at slightly higher speeds. That's not such a bad prize, is it?