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In-depth reviews

BMW Z4 review - MPG, CO2 and Running Costs

Fuel consumption should be reasonable, but insurance and maintenance will be less so

Even the sportiest BMW Z4 M40i can show a respectable level of fuel consumption when driven with a modicum of restraint. The official figures suggest 38.1mpg is on the cards in mixed driving, but give in to the temptation of the M car’s easily accessible performance and that figure will quickly dip. The fuel tank isn’t that big either at 52 litres, so you could end up making frequent fuel station stops.

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The official WLTP fuel figures for the four-cylinder models are even more impressive with both the sDrive20i and sDrive30i able to beat 47mpg under test conditions. Some owners may get close, but many won’t be able to resist driving with more sporty intent.

CO2 emissions of 168g/km for the M40i means company car drivers will face Benefit-in-Kind tax bills approaching the top bracket. The two four-cylinder Z4s emit 138g/km and so company drivers will face a BiK hit that’s around six per cent lower. All versions except the sDrive20i cost over £40,000 which means you’ll have to stump up £450 in road tax for each of the first five years. The sDrive20i will be £140 per year if you steer clear of optional extras.

Insurance groups

BMW has yet to release details of insurance group ratings for the Z4 line-up, but given the performance and cost of the various models we’d expect none to attract a rating below group 40. The top of the range Z4 M40i insurance is likely to be in the same ballpark as the Porsche Boxster S which attracts a group 46 rating.

Depreciation

Premium sports cars tend to be in demand on the used car market, and the BMW Z4 doesn’t buck the trend. That means it’s a relatively safe place to put your money, with residual values of around 50 per cent for the 2.0-litre models and a slightly lower return for the M40i at around 47 per cent. Optional extras such as the M Sport Plus package will add desirability at resale time

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Which Is Best

Cheapest

  • Name
    sDrive 20i Sport 2dr Auto
  • Gearbox type
    Semi-auto
  • Price
    £36,720

Most Economical

  • Name
    sDrive 20i Sport 2dr Auto
  • Gearbox type
    Semi-auto
  • Price
    £36,720

Fastest

  • Name
    sDrive M40i 2dr Auto
  • Gearbox type
    Semi-auto
  • Price
    £48,760
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