Using Custom class, to have the same performances of the AIs you must use the default car and then, in the garage, change tires to Racing Slick.

That is exactly what you must do in case of using TrackDay, so it is almost useless. The Custom car is mainly addressed to the persons that are thinking to buy the real-world car and that want to test several different items.

Definitely, the best class for racing on tracks against the AIs, is the TrackDay Multiplayer and this is the reason I added this class. With this class tires lasts much less than real-world tire and racing against AIs is possible also using the R-Dot: it depends of the race length! I tuned the wear of the different compounds taking care to this option... R-Dot are less performing BUT last much more than the Racing Slick and there is a point of the race that AIs must pit for replacing their tires... on the contrary the human that uses the R-Dot can still drive. Of course the race must be of a certain time and it depends of several reasons, like the track layout, the asphalt grip, the weather conditions (partially at the moment), your skill, AI performance settings...

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