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Porsche 718 Cayman GT4 vs BMW i8 Coupe I12: 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.

sports car2020 vs 201815,000 km/anMixedPetrol 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

APorsche 718 Cayman GT4

3,742 €per year

11,5 L/100 km weighted · 24.94 € per 100 km · 1 724 L per year

GapComparison unavailable - manufacturer data being validated.

BBMW i8 Coupe I12

Comparison unavailable - manufacturer data being validated.

What produces these figures

WLTP combined: 11.0 L/100 km · 100.0 kWh/100 km
Powertrain: Combustion · Plug-in hybrid
Power: 420 ch · 374 ch
Kerb weight: 1,451 kg · 1,535 kg

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Frequently asked questions

What is the range of the Porsche 718 Cayman GT4 vs the BMW i8 Coupe?

The declared range of the BMW i8 Coupe is 55 km (WLTP/EPA). In real-world conditions, expect 10-20% less.

Result · yearly energy cost

What produces these figures

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What produces these figures

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