Parkers overall rating: 4.4 out of 5 4.4

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

Petrol engines 3.5 - 5.3 mpp
Diesel engines 5.4 - 7.0 mpp
Plug-in hybrid petrol engines 34.1 - 39.8 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.
Based on "Weighted" mpg; figures depend on the proportion of miles driven in pure electric mode and may vary widely

Fuel economy

Petrol engines 20.8 - 31.4 mpg
Diesel engines 32.8 - 42.2 mpg
Plug-in hybrid petrol engines 201.8 - 235.4 mpg
  • X5 won’t be the cheapest car to run
  • Diesels offer best economy
  • Plug-in better for town use

There won’t be an X5 that’s truly cheap to run. After all, something’s got to power that huge body around. Unsurprisingly the petrols will be costly to run thanks to high fuel consumption. If you’re just driving it around town most of the time, then it might be worth a look as the costs will be easier to stomach. The xDrive40i claims 25-27.2mpg, while CO2 emissions are rated between 162g/km and 166g/km. However, if the car has seven seats then there’s an increase up to 170g/km for some models.

The M50i is the thirstiest in the range, with BMW claiming 22.4-23mpg, so don’t expect great things if you make the most of that 530hp engine under the bonnet. CO2 emissions aren’t too bad, though, rated at 165g/km.

Go for the plug-in hybrid xDrive45e and BMW claims it’ll do up to around 135mpg, but there’s a catch. You need to be plugging the car in regularly and using it just on battery power all the time to get anywhere near that number. Otherwise you’ll just be running a big, petrol SUV. CO2 emissions are impressively low, however, with BMW claiming the xDrive45e produces just 41g/km of CO2 in M Sport trim. It’s 39g/km for the xLine model.

What's most impressive on the BMW X5 plug-in hybrid is the ability to drive up to 60 miles on e-power alone; it is capable of wafting silently along at motorway speeds and if you can charge up overnight easily at home, and often do short trips day-to-day, it's well worth considering.

Things are better with the diesel options in terms of fuel economy for those driving more varied routes day-to-day. The xDrive30d returns between 34 and 37.7mpg – which should be easy to achieve – while the M50d claims up to 33.6mpg. Take advantage of that torquey engine and 400hp, however, and it’ll dip below 30mpg with ease. This also has the highest CO2 emissions of the range at 194g/km, while the xDrive30d matches the petrols at around 165g/km (159g/km for an xLine on smaller wheels).

Is it reliable?

  • BMW has a mediocre reputation for reliability
  • The X5 looks and feels high quality and well built
  • Two recalls for 2018 models, but affected a handful of cars

BMWs tend to have impressive quality, but that it not reflected in the overall reliability for the product – and the latest X5 shouldn’t prove to be any different. At least not mechanically. The engines are used throughout the BMW Group in several other models, and the same goes for things like the xDrive all-wheel drive systems.

There have been two recalls affecting cars built in 2018, but each one affects fewer than 20 cars in each case, so there’s little to worry about if you’re buying new. And if you do need some extra peace of mind, the company’s three-year, unlimited mileage warranty will keep you covered.

Servicing an X5 won’t come cheap, however, and we’d keep an eye on the car’s media system for software updates. It features BMW’s latest iDrive 7.0 system and we’ve found it can have a few glitches when we’ve tried it in other models. No huge deal, though – it’s mainly been when using Apple CarPlay, with no issues found when using the main operating system.

Ongoing running costs

Road tax (12 months) £480 - £490
Insurance group 43 - 50
How much is it to insure?