Parkers overall rating: 3.5 out of 5 3.5

Miles per pound (mpp) Miles per pound (mpp)

Reliable fuel consumption data for comparison purposes is not available for this model.

Fuel economy

A more stringent standard for fuel economy (WLTP) was introduced from September 2017, and this model was not required to undergo that test. Its fuel economy measured under the previous test system was 20 - 32 mpg. However these figures are less likely to be achievable in real world driving and so should never be compared to another car's mpg which was measured under the newer, more realistic WLTP system.

The FX is an expensive car, but represents good value when its specification is considered alongside alternatives like the BMW X6 and Porsche Cayenne. However, Infiniti FX running costs will be high: it is very thirsty (economy is less than 25mpg) and annual road tax will also be high. Servicing should be on a par with Porsche, but with only a handful of dealers, it may not be as convenient.

Infiniti does offer a free pick up service for customers within 150 miles of the nearest Infiniti dealership.

Infiniti FX emissions are high. Both petrol models are thirsty and their CO2 will put them in the highest road tax bands - the 3.7-litre emits 282g/km and the 5.0-litre puts out 310g/km of CO2. The diesel returns an average of 31mpg and emits 238g/km of CO2.

Although the engines are new, Infiniti FX reliability shouldn't be questionable because they should follow the traits expected of a Japanese manufacturer (Infiniti is a division of Nissan) and offer good mechanical reliability.

Ongoing running costs

Road tax (12 months) £330 - £580
See tax rates for all versions
Insurance group 48 - 50
How much is it to insure?