LionKing wrote:What about friction? If you have 5 tons of downforce pushing the car down in normal direction, wouldn't you have a lot more friction?
Friction on a tyre is quite complicated IMO. In a lab if you were doing friction coefficient experiments between a wooden block and a table top - then more friction would mean the block slides slower. But on a tyre, you want more friction between the tyre and the road for better grip.
Rolling resistance I suppose could be somewhat offset by this lift though I suppose. There would be less deformation in the contact patch (given that the tyre remains rounder in the lack of that extra vertical loading, and less engine power is consumed to deform the tyre to the contact patch.
During DRS open, when you're not needing that friction there? Hmm... it's an interesting thought.