In-depth reviews

Peugeot 508 review - MPG, CO2 and Running Costs

The 1.5-litre diesel is the economy champion, but watch out for potentially high insurance costs

Despite its sleek looks, the Peugeot 508 shouldn’t cost an arm and a leg to run, offering reasonable economy and CO2 levels for competitive Benefit-in-Kind (BiK) company car tax ratings.

It shouldn’t come as a great surprise that the 1.5 BlueHDI 130 model is the most fuel efficient, offering between 52.5 and 59.8mpg under the latest WLTP guidelines. That’s with the six-speed manual gearbox, the figures are 51.4 to 58.6mpg with the eight-speed auto. This compares well to the Volkswagen Passat 1.6 TDI diesel with the seven-speed DSG transmission, which records figures of between 49.6 and 52.3mpg. With commendably low CO2 emissions figures starting at 99g/km for the automatic and 101g/km for the manual the Peugeot 508 1.5-litre diesel sits in favourable BiK bands. 

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Choosing the more powerful 2.0-litre diesel in the 508 does affect economy, with the BlueHDi 160 returning 45.2-51.1mpg and the more powerful BlueHDi 180 posting official figures of 45.0 and 50.6mpg. That’s slightly less economical than the 2.0 TDI Volkswagen Passat, but more economical than the similarly powerful Vauxhall Insignia Gran Sport. CO2 emissions for these models start at between 118 and 124g/km respectively. 

The two faster petrol models are less fuel efficient than their diesel counterparts, the PureTech 180 returning between 38.0 and 41.8mpg and emissions of 123 and 127g/km. The more powerful PureTech 225 isn’t far behind, with economy of 36.3-39.8mpg and emissions of between 130 and 132g/km.


When it comes to insurance, it’s likely that the 508 will be broadly competitive with its class rivals. But some competitors do have lower groupings, especially for entry-level models. The 1.5-litre diesel will be the cheapest to insure, with groups ranging between 22 and 24. The Vauxhall Insignia starts at group 15 for its 134bhp diesel, while the slightly less powerful Volkswagen Passat 1.6 TDI starts with a group 12 rating.

The more powerful 508s fall into groups 29 to 32 for the diesels and 28-34 for the petrols. By way of comparison, the Passat has the highest insurance group of 28.


From launch, the Peugeot 508 has residuals in the 43-45 per cent range, which isn’t bad when you consider that the family hatchback class is falling out of favour with new car buyers. In comparison, the Vauxhall Insignia Grand Sport has values in the region of 34-41 per cent, with the VW Passat scoring similarly.


Which Is Best


  • Name
    1.5 BlueHDi Active 5dr
  • Gearbox type
  • Price

Most Economical

  • Name
    1.6 Hybrid Allure 5dr e-EAT8
  • Gearbox type
  • Price


  • Name
    1.6 PureTech 225 GT 5dr EAT8
  • Gearbox type
  • Price

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