BMW 840d xDrive Gran Coupe G15 vs Porsche Boxster Spyder: 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.

limousine2021 vs 201015,000 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 840d xDrive Gran Coupe G15

Comparison unavailable - manufacturer data being validated.

7,7 L/100 km weighted · 1 160 L per year

GapComparison unavailable - manufacturer data being validated.

BPorsche Boxster Spyder

3,327 €per year

10,2 L/100 km weighted · 22.18 € per 100 km · 1 533 L per year

What produces these figures

WLTP combined: 5.9 L/100 km · 10.1 L/100 km
Powertrain: Mild hybrid 48 V · Combustion
Power: 340 ch · 324 ch
Kerb weight: 1,995 kg · 1,300 kg

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BMWVSPorsche

Result · yearly energy cost

What produces these figures

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