In-depth Reviews

Jaguar XJ saloon - MPG, running costs & CO2

The Jaguar XJ diesel engine offers decent fuel economy, but overall running costs remain high

Carbuyer Rating

3.6 out of 5

Owners Rating

4.6 out of 5

Read owner reviews
MPG, running costs & CO2 Rating

2.5 out of 5

Available only with a 3.0-litre diesel engine, every; XJ comes with start-stop technology as standard – this 'pauses' the engine when you're stopped in traffic to save fuel.

Insurance won’t be cheap, either, but Jaguar does at least offer fixed-price servicing, so your running costs will be predictable. Just bear in mind that the XJ will lose quite a lot of its new value over the typical three years of ownership, although this is normal for big luxury saloons.

Jaguar XJ MPG & CO2

There's only one engine offered for the XJ: an economical 3.0-litre diesel that’s capable of 37.9mpg with CO2 emissions of 184g/km. Newer rivals like the Mercedes S-Class S350d deliver slightly better figures at 44.1mpg and 160g/km CO2. Upgrading to a version of the XJ with larger alloy wheels slightly increases CO2 emissions.

Business drivers should note that, unlike the XJ, the Mercedes S-Class and even the Porsche Panamera have plug-in hybrid versions that push claimed fuel-economy figures into triple digits and reduce company-car payments to far more palatable levels.

Insurance group

Insurance won’t be cheap no matter which model you choose: the XJ is rated from groups 48 to 50.


All Jaguar models come with a three-year warranty as standard, which is fairly average for a car of this type. That can be extended further and an optional roadside assistance service can be included, too, at extra cost.


Despite the premium badge, Jaguar offers fixed-price servicing for the XJ, so you shouldn't get any surprise bills. Service plans for a newly registered XJ will last for three years and up to 48,000 miles, costing around £1,500.

Once the car is aged three years or more, customers can choose fixed-price servicing, with an interim service costing £255 and a major service costing £395. Jaguar dealers will charge £695 for a cambelt change and £45 for a brake fluid change.

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