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Price, fuel economy and range, finance and depreciation

As much as Infiniti Ms are a rare sight, so are Infiniti dealers. The number is increasing, but for the time being there are no more than a handful of dealers who’ve invested in the sumptuous surroundings that goes with what Infiniti calls its “total ownership experience”.

Customers are promised an experience to rival or even beat that of Lexus. Showrooms are more like luxury boutiques with plenty of attention to detail when it comes to the showroom itself and the level of service.

Your proximity to a dealer shouldn’t be a problem when it comes to aftersales, either – Infiniti will take care of collecting and returning the car when it needs servicing.

So you’ll be treated like a VIP by your dealer, but you’ll also be expected to pay VIP money. Even with its lavish equipment list, the M is pricey next to rivals – there’s certainly no financial advantage in choosing an Infiniti. The M30d is comprehensively beaten in terms of fuel economy and company car tax, too. Road tax isn’t cheap for private buyers.

The hybrid makes a good case for itself, though – it’s priced just below a top spec M30d yet has far better performance and better economy, too. A claimed average of 40.9mpg is about 3mpg up on the diesel, while a combination of low emissions (159g/km of CO2) and petrol power (no diesel company car tax surcharge) makes it a considerably more affordable company car.

As you’d expect, the 3.7-litre V6 isn’t especially frugal – mid 20s is the best sort of mpg returns you could hope for. On the plus side, equipment levels are superb and go some way to compensate for the high prices.

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Surprisingly, the Infiniti’s residuals are as good as those of a high-spec BMW 5 Series or Mercedes Mercedes-Benz E-Class but fall noticeably short of its more numerous mid-spec rivals.