To be perfectly honest, you couldn't tell on the 640d - it has been done so seamlessly and is very convincing. Lovely little V6 warble.
That the 640d then achieves under 150gm/km CO2 and VED of £135/year is absolutely astonishing - not to mention the impressive fuel economy when compared to other cars of this weight/class - particularly the woeful Jaguar XJ and Audi A7 that are left for plain dead.
But nothing sounds as god as a Maserati on the over burn.
Hehe
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