Hello you all good people out there.

Have a 92 300CE. The idle and cruising rpm are as follows:

idle = 600-700 rpm
40mph = 1,800-1,900 rpm
50mph = 2,250-2300 rpm
60mph = 2,900-2950 rpm

They seemed to be high compared with my other Japanese cars. Is this normal? Secondly, what is an ASR and what does it do. Does the ASR affect rpms or transmission gear changes?

Thanks a bunch.