Astonishing performance, economical and CO2 emissions that can moisten the eyes of a Green Peace warrior. Is the BMW 640d too good to be true?

When I was given the keys of the BMW 640d Coupé, my immediate reaction was common: I've already played around with the fast and furious, petrol-powered 650i and the experience was just fantastic! The 640 'D' has a diesel heart and the term 'petrol-heads' doesn't gel well here, you know. So, I made a simple plan: let the Editor take the diesel-yawn-powered 'sportscar' for a performance test, see the poor results and scrap the article, as I sit back and enjoy the lingering taste of the 650i.