New test procedure hasn't helped the XF's economy or emissions figures

If you’re after a CO2 champion, then you need to look elsewhere in the executive saloon market, as the XF doesn't fare well, especially under the latest WLTP tests. The lower-powered 2.0-litre diesel manual is still the cleanest XF, but rather than emitting 104g/km on the NEDC test, it now manages 124g/km on WLTP. Unless you’re a business buyer really looking to same some cash, the 135g/km auto is a better bet (although this is up from 109g/km, pre-WLTP).

The 178bhp 2.0d is only marginally poorer for emissions, so it's worth sacrificing some Benefit-in-Kind costs for its added performance. It manages 126g/km with the manual, the same 135g/km as the 161bhp auto, or 144g/km if you also add AWD.

Fuel economy for these engines is as follows: up to 50.4mpg for the 161bhp diesel manual, 49.9mpg with the auto version, up to 50.9mpg for the 178bhp diesel, with the auto quoting the same 49.9mpg as the lower powered diesel. Adding AWD to the 178bhp motor sees a best economy figure of 44.4mpg. While these figures are overall poorer than in the past, they're a more realistic reflection of what you can expect to achieve in everyday driving.

The 237bhp twin-turbo diesel, is another step poorer than the other diesels. As it's only available as an auto with four-wheel drive, it manages up to 42.7mpg in the WLTP tests, while emissions are as high as 155g/km. While private buyers might feel this is worth the extra punch, business users (who are a big chunk of this car's market) will likely be put off. 

Go for the V6 diesel S, and fuel economy is actually better than the twin-turbodiesel, thanks to this car being rear-wheel drive. It returns up to 43.2mpg, although emissions are higher, at 157g/km.

Tuyrning to the petrol engines, and the 247bhp 2.0-litre Ingenium motor returns up to 34.4mpg on the WLTP test, down from 41.5mpg on the NEDC cycle. Emissions of 166g/km mean it's more of a private purchase than a business one. Go for the 296bhp 2.0-litre petrol, and a claimed maximum of 32.6mpg is quoted, which isn't that bad a penalty when you consider it comes with AWD as standard. Emissions are quoted at 171g/km, which is the highest figure in the XF range.

It hasn't been tested under WLTP conditions, but the older petrol V6 S is, unsurprisingly, costlier to run, with a claimed efficiency of 34.0mpg and 198g/km CO2 in the NEDC test, meaning you’ll pay the price at the pumps compared to the rest of the range.

The XF's price range means that just over half of the line-up crosses the £40,000 threshold premium road tax. That means higher spec models will cost more than £450 in road tax for the first five years of ownership, before dropping to the standard rate.

Insurance groups

Insurance costs should be on a par with its rivals, but for the higher-powered XF Prestige 2.0D auto we found a cheaper premium quote than the equivalent BMW and Audi 2.0-litre diesel SE models.

The XF’s insurance group ratings range from 25 to 42, with the S models rated higher. The diesel S will attract the highest premium at group 42.

Depreciation

The XF is one of the older cars in its class, and its residuals reflect that. It'll hold on to anywhere between 37-41 per cent of its value after three years/60,000 miles from new, which is around 7 per cent behind the BMW 5 Series.

Overall, the XF Sportbrake has slightly better like-for-like residuals, although of course you're paying more for it in the first place.