Porsche 911 Carrera 4 Cabriolet 991.2 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 car · 2017 vs 2018 · 15,000 km/an · Mixed · Petrol 95 2.17 €/L · Home 0.20 €/kWh · Methodology

Annual mileage

15,000 km

5,000 km50,000 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 911 Carrera 4 Cabriolet 991.2

3,499 €per year

10,8 L/100 km weighted · 23.33 € per 100 km · 1 613 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: 10.7 L/100 km · 100.0 kWh/100 km
Powertrain: Combustion · Plug-in hybrid
Power: 375 ch · 374 ch
Kerb weight: 1,550 kg · 1,535 kg

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Frequently asked questions

What is the range of the Porsche 911 Carrera 4 Cabriolet 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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Frequently asked questions