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Parkers overall rating: 4 out of 5 4.0

Miles per pound (mpp) Miles per pound (mpp)

Petrol engines 5.4 - 7.4 mpp
Low figures relate to the least economical version; high to the most economical. Based on WLTP combined fuel economy for versions of this car made since September 2017 only, and typical current fuel or electricity costs.

You don’t need to be an expert to identify the diesel, rather than the turbocharged petrols, as the winner here.

Low CO2 emissions and high (claimed) mpg figures suggest the 250d is the one to go for if you’re concerned about keeping costs down.

Pick the SLC 250d if you want low CO2 emissions – this produces just 114g/km despite being a sporty open top roadster.

Second- and third-generation cars have been largely problem free and we expect nothing different from this mildly updated version.

Ongoing running costs

Road tax (12 months) £30 - £465
See tax rates for all versions
Insurance group 41 - 46
How much is it to insure?