BMW 540d xDrive Touring G30 vs Porsche Cayman S: which is cheaper to run?

What each kilometre costs, depending on your driving profile, how you charge and the share of the trip driven on electricity or fuel.

grand tourer2020 vs 201415,000 km/anMixedDiesel 2.38 €/L · Petrol 95 2.17 €/LHome 0.20 €/kWhMethodology

Annual mileage

15,000 km

Driving mix

30 % City · 50 % Road · 20 % Motorway

Fuel price

Petrol 95 2.17 €/L · Diesel 2.38 €/Lprix-carburants.gouv.fr — moyenne nationale du 05/10/2026 ; EDF Tarif Bleu Base au 01/08/2026 ; DC autoroute : moyenne des réseaux sans abonnement

Charging type

Result · yearly energy cost

ABMW 540d xDrive Touring G30

Comparison unavailable - manufacturer data being validated.

7,1 L/100 km weighted · 1 066 L per year

GapComparison unavailable - manufacturer data being validated.

BPorsche Cayman S

4,168 €per year

12,8 L/100 km weighted · 27.79 € per 100 km · 1 921 L per year

What produces these figures

WLTP combined: 5.4 L/100 km · 10.3 L/100 km
Powertrain: Mild hybrid 48 V · Combustion
Power: 340 ch · 330 ch
Kerb weight: 1,925 kg · 1,320 kg

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Result · yearly energy cost

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Result · yearly energy cost

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