In-depth reviews

BMW X5 review - MPG, CO2 and running costs

Fuel efficiency is good for a hefty SUV, but other running costs won’t be cheap

The BMW X5 is big, heavy and not short on performance, so in relative terms efficiency is fairly strong. The figures are an improvement over the previous-generation X5’s, too.

If you’re looking to minimise running costs, the X5 to go for is the xDrive45e. It has a 3.0-litre six-cylinder engine and electric motor powered by a lithium ion battery with a 24kWh capacity. The impressive all-electric range of up to 54 miles helps deliver a combined fuel consumption figure of between 201.8 and 235.4mpg under WLTP testing. 

The xDrive30d will return average consumption of up to 42.2mpg, but emissions from 175g/km put it into the 37% Benefit-in-Kind (BiK) bracket, so it’s not cheap from a company car tax perspective. The other current diesel option is the 335bhp xDrive40d, which offers greater performance, yet still returns 39.2mpg and 188g/km of CO2. 

The petrol-engined xDrive40i is a lot thirstier at the pumps, with an average fuel consumption of 31.4mpg and 205g/km of CO2.

The M50i is strictly for those with deep pockets, as the 4.4-litre V8 only manages a combined 23.9mpg with CO2 emissions of 263g/km, while the M Competition model is even less efficient with economy of 22.1mpg and producing 292g/km of CO2. 

Insurance groups

As to be expected of a powerful, premium SUV, insurance groups start rather high at group 45 for the xDrive30d. The rest of the lineup ranges all the way up to group 50 for the M50i and X5 M Competition.


The undoubted cachet of the BMW badge, the novelty value of the latest-generation X5 and the appeal of its style and technology should mean residual values remain strong. However, a comprehensive service record is vital at this end of the market, and owners would do well to care for their investment scrupulously to avoid paying a price at resale time.

Government approaches to petrol and diesel are causing uncertainty, and that could conceivably lead to weaker used prices in future. If you’re especially worried about that, it might be worth considering investing in the xDrive45e.

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