HYPNOTIZED by the sea blue BMW that slipped into my parking space a few weeks ago, I stopped wondering about how fast this test car would go or whether it could stop at all. You should do the same. But if you insist on details and are given to using words like downforce and stoichiometry, be assured that the 2010 edition of the Z4 is plenty fast and halts like a drill instructor. Will it describe an asphalt arc as mathematically as the Porsche Boxster? No. But here’s the dirty little secret of luxury convertibles: most buyers don’t do math. For those who would consider dropping $50,000 or even $60,000 on a two-seat driveway ornament, this is what matters: the BMW is beautiful, inside and out. It’s the most luxurious convertible this side of … Read entire article »