For This twin-turbocharged engine gives phenomenal pace, yet its emissions only put it into the 27% company car tax band.
Against If you want the very best economy in a 7-Series, you'll need the 730d. Likewise, the extra cost of this model may push you towards the smaller-engined model
This is an astonishing piece of engineering, and a very desirable car, but it's not quite enough to change our opinion that the 730d is the more sensible buy
There are five versions of the 7 Series, based on three engines and two wheelbases. The one constant is that they're expensive to buy or lease, depreciate heavily and have running costs beyond the pockets of most of us.
With all this in mind, the 3.0-litre turbodiesel – currently the most economical, lowest-emitting luxury car on sale – will be the choice of around nine out of 10 buyers. There's no lack of performance, driving pleasure or luxury with it, though you can't yet have it with the longer wheelbase.
We've yet to drive either of the twin-turbo 3.0-litre six-cylinder 740s, but have tried the long-wheelbase 750Li with a twin-turbo 4.4-litre V8. The engine's magnificent, but likely to be a rarity here because of the impact it has on costs. Both petrols are available in long-wheelbase form for an extra £3000.
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