@Teutonic_Tamer
Thank you for your explanation.
You are very welcome.
When I referred same class, I was thinking about Summer Performance Tyres, that magazines compare together.
And your thoughts are correct - they are all classified as summer performance tyres. But so is the Goodyear EfficientGrip!
But in reality, it is certain specific attributes which individual folks require from their tyres. Some may well seek a long tyre life and high mileage. I personally don't consider that to be a priority. Being a Brit, my personal over-riding attribute is the highest possible grip levels when cornering at high speeds on wet roads. But I'm guessing being as you live in Portugal - wet grip requirements are low down your priorities. And about 99% of Americans don't look for grip in corners at all. Americans (who seek a 'high performance' tyre) want grip in a straight line - ie, grip when accelerating (traction) and decelerating (braking) in a straight line. Additionally, Americans also seek comfort - hence why Goodyear (and other American tyres) have soft, weak sidewalls - which provide a lot of flex, and therefore a lot of cushioning. Americans would hate Continentals - which have very stiff sidewalls and a very sturdy overall carcass. Continental tyres would give a very harsh, unforgiving ride to Americans, when compared with equivalent size and specification Goodyears.
If you have the patience to elaborate more where the Goodyear fail compared to the European brands, I would appreciate. For my personal experience Goodyears have good grip, good durability, soft side walls, are more unbalanced tyres from new and it only gets worse with use, so they need to get calibrated more often maybe... They keep a good grip even when they reach the limit of the legal tread depth.
I touched on the specifics in Reply #38
I don't think there has ever been doubts that Goodyear Eagle F1 Asyms give good grip - particularly in the dry in a straight line. And, yes, maybe in the straight and dry, they might well grip slightly better than say the equivalent Continental. But take your car with Goodyears to Germany, and cruise at 250kmh on one of their autobahns - and at best, you will find the car very 'fidgety', and will get white knuckles from holding the steering wheel tight. Do the same journey in the same car, but with Continentals - and the ride will be considerably more relaxed, the car will be massively more stable at very high speeds - and it will even be possible to relax your grip on the steering wheel - even letting go. Again, on that same 250kmh autobahn blast - if someone pulls into your lane ahead on your Conti shod car - when you stamp on the brakes hard - your car will brake with perfect stability in a straight line. With Goodyears, it will stop in a similar distance to the Contis, but the loss of stability will be truely frightening - a Goodyear shod car will squirm uncontrollably, you will be fighting hard with the steering wheel - and you will probably need a change of underpants!
So, sure, Goodyear Eagle F1 Asymms can give good grip in very specific attributes. But as an all-weather, three-season tyre with rock-stable tracking - there are much better offerings over the Goodyear.
I hope this helps. I need my bed now, so I shall return tomorrow if further help is needed.