@Aleksander Pienkowski
Seconds - more time with more effort put into it.
Setup knowledge and driving skills should go together - as outlined in the Driver skills overview in the FAQ:
http://www.racedepartment.com/threa...scription-updated-for-1-0.91105/#post-1788757
Not only you gain lap time, but also confidence in the overall behavior of the car with a well balanced setup. You know what it will do in extreme situations - lift off oversteer with worn tyres or understeer with high fuel load.
Just downloading a given setup from another driver is a risky thing. Driving styles and setup preferences are subjective and personal. You don't necessarily know exactly why a certain value was chosen. If you make a setup yourself, you generally have a reason why you adjusted something.
As mentioned yesterday with driving lines, the goal should be to learn the principles of setup tuning, so the car or track you apply them to are less relevant. These principles are written in the setup guide. Why these are so and how they work will be the topics of the next, more in depth setup guide.
The next Ghostbusters event will feature a mid-engined car. Having done that, we'll have completed all three car layouts - FWD, RWD-front-engnined, RWD-mid-engined. AWD isn't implemented yet.