Well I have just handed in the keys, I received an "upgrade" to an Opel. Quite a let down, especially as walking to the car I passed a whole lot of Porsches one of which I wouldve been happy to take care of. Driving on the Authobahn in a car that battles to go past 160 is not fun, especially when it takes so long to get there from 120.
Next time will rent a higher group.
Thanks for all the input.