BMW X6 review - MPG, CO2 and running costs
Diesels offer respectable economy, but running costs for the X6 are relatively high, particularly for company users
Diesel still rules in this class for fuel economy and CO2, particularly when there’s no plug-in hybrid available. That leaves the xDrive 30d as the most frugal of the X6 range, capable of up to 42.8mpg, depending on specification, with corresponding CO2 figures of between 172 and 188g/km. Next up is the 40d, whose 38.7-41.5mpg numbers are surprisingly not too far behind despite the extra output - it’s still using essentially the same 3.0-litre inline six diesel engine, just in a different state of tune. CO2 here is quoted as 179-193g/km, again depending on factors like wheel and tyre size.
The petrols will guzzle slightly more than their diesel counterparts both in the lab and on the road. For the 40i that means around 30mpg and CO2 of more than 200g/km, while the M50i registers 24.4-25.0mpg and up to 265g/km of CO2.
If the X6 M Competition topped the tree for performance then it’s somewhere underground in terms of economy, with slightly terrifying WLTP combined economy figures of 21mpg and entire clouds of CO2 exiting the tailpipes every kilometre. If you choose to exploit the X6 M's full performance then be prepared for the fuel gauge to drop rapidly.
Insurance premiums will be high whichever X6 model you opt for. In fact, the 30d version in Sport trim is the only X6 not to be in the highest group 50, although you probably won't save too much as it sits in group 49.
Customers should see pretty decent residual values for the the X6 over three years and 36,000 miles of ownership. Our expert data suggests that, on average, the coupe-SUV should retain between 52 and 54 per cent over this period, with the 30d models performing the best.
In this review
- 1BMW X6 reviewBMW’s latest X6 is its best take on the format yet, and as good to drive as ever
- 2Engines, performance and driveThe best-driving X6 yet, with good ride and handling and ample performance whichever engine you opt for. X6M’s ride is punishing, however
- 3MPG, CO2 and running costs - currently readingDiesels offer respectable economy, but running costs for the X6 are relatively high, particularly for company users
- 4Interior, design and technologyThe cabin is just as attractively-styled and well-built as its X5 sibling, while BMW’s iDrive system remains one of the best infotainment setups
- 5Practicality, comfort and boot spaceIncreased size has benefitted space inside the X6, with greater interior volume and a usefully-sized boot, despite the sloping roof
- 6Reliability and safetyBMW’s warranty is fairly average for the industry, but safety kit is particularly good