BMW 2 Series Convertible - MPG, running costs & CO2

The BMW 2 Series convertible diesel returns more than 60mpg and even the quick petrols are pretty efficient

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Few cars offer such a compelling blend of low running costs and massive driver appeal - although the BMW 2 Series convertible can quickly become an expensive model to buy in the first place. And the Audi A3 Cabriolet is likely to hold more of its value on the used market than the BMW.

BMW 2 Series Convertible MPG & CO2

Up-to-date turbocharging technology is helping many of the latest petrol engines get closer to diesel MPG figures and the BMW 2 Series convertible is a good example of this. The entry-level BMW 218i petrol can return 50.4mpg with an automatic gearbox (or 48.7mpg with a manual) and emits between 131 and 139g/km of CO2. This means company car drivers will face a Benefit-in-Kind liability of 25 or 26%

Next up, the BMW 220i returns between 43.5 and 46.3mpg depending on which gearbox and wheel combination you go for, as manual gearboxes and larger wheels have a detrimental effect on these figures.

In the faster BMW 230i petrol, the automatic returns 46.3mpg, and it's rather more economical than the high-performance M240i convertible – it returns 34.0mpg with a manual gearbox.

The diesel versions offer an impressive blend of power and economy. For 2018, every version has been updated with emissions-reducing AdBlue technology, further cleaning up tailpipe gases. The entry-level BMW 218d convertible will return 54.3mpg on average. Its CO2 emissions figure of 136g – as measured via a WLTP regime that should be more representative of everyday driving than the previous method, means a stiff Benefit-in-Kind (BiK) figure of 29%.

The more powerful BMW 220d actually returns slightly better economy of 55.4mpg, but sits in the same BiK bracket. The most powerful diesel - the 248bhp BMW 225d – comes exclusively in M Sport trim and with an eight-speed automatic gearbox. Despite the extra power, it's even more fuel efficient, returning a claimed 56.4mpg, while 130g/km CO2 emissions mean a lower 28% BiK rating.

All BMW 1 Series Convertibles will attract road tax of £140 a year, but those with a list price (including options) of more than £40,000 are liable for an additional surcharge of £310 a year in years two to six of ownership, bringing the annual bill to £450 during that period.

Insurance group

Insurance groups for the BMW 2 Series convertible start at 22 for the entry-level petrol and diesel models. The powerful BMW M240i, however, sits in group 42.


Like all new BMWs, the 2 Series convertible gets a three-year/unlimited-mileage warranty covering any mechanical problems that may arise in the first few years of ownership. This is better than the 60,000-mile warranty you get on an Audi A3 Cabriolet.


BMW 2 Series convertible buyers can pay for five years or 50,000 miles worth of servicing upfront with a one-off payment. There's also an optional Service Inclusive Plus package that covers consumables such as brake pads and the car's clutch.

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