In-depth Reviews

Mercedes B-Class MPV - MPG, running costs & CO2

No hybrid option, but B-Class petrol and diesel engines are economical

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Unlike the BMW 2 Series Active Tourer, which can be chosen in plug-in hybrid form, the B-Class is only available with conventional petrol and diesel engines. Claimed fuel economy for the diesels is impressive, but the B250 petrol has quite a thirst for fuel. You can spec a B-Class with either a seven or eight-speed automatic gearbox.

Mercedes B-Class MPG & CO2

The 114bhp 1.5-litre diesel is the economy champion of the B-Class range – Mercedes claim it can achieve up to 60.1 mpg depending on the size of wheels fitted, while CO2 emissions are rated as 122g/km.

The latest B-Class is also offered with the 2.0-litre diesel engine that debuted in the Mercedes E-Class. It features here with an eight-speed twin-clutch DCT automatic gearbox (all other B-Class models get the older seven-speed DCT) and can be chosen as a 148bhp B200 d that manages up to 56.5mpg, or as a 188bhp B 220 d that returns an almost identical figure. CO2 emissions range between 132 and 141g/km. As this engine complies with Real Driving Emissions 2 (RDE2) standards, it's not subject to the 4% BiK diesel surcharge that affects the 1.5-litre diesel fitted to the B 180 d, and so the B 200 d has a lower company-car tax band - the lowest in the range, in fact.

The 1.3-litre petrol engine will suit those who cover fewer than 12,000 miles a year, or who make primarily shorter journeys. It produces 134bhp in the B180, or 161bhp as a B200. They return up to 45.6mpg. A 2.0-litre petrol is also available and is available with 221bhp in the B250. It’s the quickest model in the range, but you may not even see 40mpg.

The B-Class will cost £145 per year in road tax, unless you get carried away with the options list and take the price of your car through the £40,000 barrier. If this happens, your car will face a £320 annual road tax surcharge, taking the total to £465 per year the first five times your road tax is due. It will, however, revert to £145 per year from the sixth time it's taxed.


The Mercedes B-Class starts in insurance group 19 for the B180 d, while the B 250 AMG Line sits in a rather high group - 31 out of 50. The petrol B180 Sport starts in group 22, while the B 200 is in 25.


Every Mercedes car requires a service annually or every 15,500 miles – whichever occurs first. You can take out a service plan to cover two, three of four services, paid either in a single lump sum or on a monthly basis. This makes it easier to budget for routine maintenance, as a workshop visit can vary in cost depending on whether an interim 'A' or major 'B' service is due, and whether mileage-dependent items like fuel and air filter replacement are necessary.


Mercedes supplies every UK car with a three-year/unlimited mileage warranty, which can be extended at extra cost when it expires. It's worth noting that Mercedes extended warranties are subject to certain exclusions, particularly when it comes to body and engine seals and electrical wiring.

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