For the first time ever I had an RPM meter on screen for some cars, and found it very very interesting. Unfortunately, not from Ferrari and McLaren (the latter being the most interesting) but here's what I know now:
BMW: 18700 rpm
Honda: 18500 rpm
Ford @ Jordan: 17600 rpm
Renault: 17100 rpm
Knowing that, and in the knowledge that Renault is to introduce a severe step for their engine, it may give them a huge boost, since that is obviously the area where they can gain the most at this moment