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Parkers overall rating: 4.5 out of 5 4.5

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

Petrol engines 4.2 - 6.2 mpp
Diesel engines 6.2 - 7.7 mpp
Plug-in hybrid petrol engines 20.2 - 22.1 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 24.4 - 35.8 mpg
Diesel engines 37.2 - 45.6 mpg
Plug-in hybrid petrol engines 117.7 - 128.4 mpg

The cheapest BMW X3 to run looks likely to be the diesel xDrive20d version for the majority of buyers. Its fuel economy is a claimed 53.3mpg, while CO2 output of 140g/km keeps VED car tax manageable. 

There doesn't seem to be a model particularly well-suited to company car drivers, however. Some user-choosers may be tempted, but with CO2 output that high we'd caution that benefit-in-kind liability is going to be very costly and it sadly doesn’t dip under the 130g/km write-down allowance threshold that many fleet managers use to decide which cars to offer on their lists. 

If you’re not doing a huge amount of miles per year or don’t fancy the idea of a diesel X3 in the current climate,there's also the petrol xDrive20i. This version offers claimed fuel economy of 39.8mpg and CO2 output of 163g/km.

The xDrive30d still offers impressive fuel economy for the performance, at a claimed 48.7mpg, while the M40i returns up to 34.4mpg. 

On all models, the size of the alloy wheels can have an impact on claimed fuel economy figures and CO2 emissions. Check the specs when you buy in case it nudges the car into a different tax bracket. 

What about hybrid or pure electric X3s?

An all-electric X3 - badged iX3 - will join the range, providing a premium SUV with zero-emission running. Great if you use it around town and can charge at home. 

Green credentials

The X3's CO2 emissions are par for the course for this type of car. The best performer is the xDrive20d, emitting 140-146g/km, while the more powerful xDrive30d produces 154-160g/km. 

If you prefer petrol power, expect higher CO2 emissions of between 163-166g/km for the xDrive20i, while the higher performance M40i emits between 188-193g/km. 


While there weren't any recalls for the previous-generation X3, the new one has already been the subject of four in its short life cycle.

These issues will have all been rectified by BMW under warranty, so there shouldn't be too much to worry about. 

Ongoing running costs

Road tax (12 months) £145 - £465
Insurance group 28 - 46
How much is it to insure?