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

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

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Like the BMW 2 Series Active Tourer, the B-Class is now available in plug-in hybrid form as well as with conventional petrol and diesel engines. Claimed fuel economy for the diesels is impressive but the B 200 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 conventional B-Class range – Mercedes claim it can achieve up to 53.3 mpg depending on the size of wheels fitted.

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 B 200 d that manages up to 54.3mpg, or as a 188bhp B 220 d that returns an identical figure. 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 diesel 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 B 180 or 161bhp as a B 200, which both return up to 44.8mpg. A 2.0-litre petrol was also available with 221bhp in the B 250 but has now been discontinued.

Business drivers are likely to flock to the B 250 e plug-in hybrid because its electric motor and battery pack give it a zero emissions range of up to 42 miles before the petrol engine kicks in. This elevates its fuel economy to 235mpg, while slashing CO2 emissions to 27g/km, for a very low BiK band. Charging at its maximum of 7.4kW can replenish the battery in just over an hour, while topping up with a domestic plug takes around 5.5 hours.

The B-Class will cost £150 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 £325 annual road tax surcharge, taking the total to £475 per year the first five times your road tax is due. It will, however, revert to £150 per year from the sixth time it's taxed. The plug-in hybrid costs £10 less a year to tax.


The Mercedes B-Class starts in insurance group 19 for the B180 d, while the B 220 d sits in a rather high group - 30 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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