First of all, Hi, I'm new here (new in posting, almost a "veteran reader"

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I don't think any of the above mentioned are serious mistakes and, apart from the typing mistake, the wheels of a particular car can be different from one country to another, so I don't really know if they are indeed mistakes. Anyway, they don't take away nothing from the great game GT4 surely is.
In all, Gran Turismo 4 will surely be the best game of its kind, and I really think GT3 is still the best driving simulator (until GT4 arrives in Europe).
But ... to be a good "racing simulator" they should increase the number of cars per race. That was my biggest hope for GT4, and it will be my biggest hope for GT5. Specially because every buyer of GT4, now that looong tracks and looong races have been included, will surely find that it will be at times boring to drive several hours in circuits as long as the Nurb or even Le Mans with only five cars to compete with.
I love endurance races, and I like very much the game "Le Mans" for the PS2. It is a very underrated game, but it is a game where you have somethings that GT3 didn't have and, from what I've read here so far (apart from realistic pit crews) GT4 will not have also. a) weather changes during races; b) day to night to day races; c) 23 AI cars (in the Le Mans race).
This game has poor graphics (compared to GT), poor sounds and the car behaviour is a litle "arcadish". But I must tell you I made the 24 hour Le Mans race twice, and I'm not sure I will endure that in GT4, running 24 hours in sunny day light and with just 6 cars scattered along the circuit. I'll try it, but I'll probably leave it, most of the time, to B-spec mode.
Well, my hope is that PD will take advantage of the possibilities the PS3 gives them and that - if they have to choose between 1.500 cars and improved graphics over or MORE AI CARS, they'll choose the second.
Cheers