Did you even read the linked article? Either you didn't, or you're just grasping at the straws for anything to support a point that really has no relevance.
Of course racing technology comes down and can be used to improve street cars-that's been true since the beginning of automobile racing.
It doesn't change the fact that you keep asking why street cars can't get the thermal efficiency of an F1 engine.
Racing engines are NOT street engines. If I could put that in bold 50 point font, I would. That's true of any racing discipline. As I've mentioned numerous times(and I'm not sure if this is even registering with you), F1 engines tend to have extremely short strokes(they are "oversquare" meaning the bore is much larger than the stroke). A short stroke engine is inherently quite efficient as it minimizes the frictional losses from the pistons moving in the bores. Short stroke engines also tend to be able to rev to very high rotational speeds. As engines tend toward oversquare designs, torque at low RPMs suffers. This is a common criticism of Japanese engines, which tend to also be oversquare, although not to the level of an F1 engine. Most people don't want to have to rev their engine to 8K rpms to get any amount of torque from it. This is in contrast to your typical "square" American V8, which is a design known for low end torque.
Second, common to most racing disciplines, you have very high compression ratios. It's become expected even for a lot of economy cars in the US to have to use 92+ octane(r+m/2), but when you get into the range of 14:1 or better(NA), or crazy boost pressures, you start needing 100+ r+m/2. That's not practical for street use. Although F1 doesn't allow it(nor does NASCAR anymore), some racing disciplines still allow leaded gasoline, which is a quick and easy to get those kind of octane ratings-of course that's illegal on the street AFAIK in most if not all of the developed world.
Again, races cars are NOT street cars. Your typical F1 car is going to spend a good portion of its time at or near its top speed. In pretty much all types of racing, you're making the assumption that you spend a good portion of your time at or near WOT. Things like camshaft profiles can be optimized for these conditions and both give crazy amounts of power as well as high thermal efficiency, but it's useless for driving on the street. This is at the other extreme of the technology spectrum, but with an aggressive enough cam profile I could probably easily get 50% more peak horsepower out of the tractor engine in my MG without changing anything else, but I'd also have a car with a rough 2K idle and with no guts below 4K.
Finally, racing engines get more attention than any street engine could ever hope to get. It's nothing for an engine to get torn down after even just a few hundred miles. A racing engine might have an expected life of 5000 miles or less. Now, people get upset if a car engine doesn't make 250K with nothing more than an occasional oil change and maybe some spark plugs every 100K. You can do thing to increase the thermal efficiency when an engine gets a level of attention that is not practical in a street car.
The more you babble on about this, the more I'm convinced that either you really have no clue what you're talking about, or just like seeing yourself post endlessly.
And to close this out, if I haven't made this abundantly clear, RACE CARS ARE NOT STREET CARS!
