WELCOME ABOARD BMW'S latest executive express, the new long-wheelbase 7-series. Now in its fifth generation, the Seven's brief remains unchanged: offer limo comfort, but drive like a purposeful sporting saloon. It's early morning and I'm hunkered down in this range-topping 750Li's firm, comfortable and now fully warmed-through rear seat. We're not allowed to drive it yet. BMW has sent a chauffeur. It's all a bit embarrassing.
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