Skip to main content
CaralogyCaralogy
HomeBrandsRoad TripBudgetDuelGuides
Caralogy

The car comparison platform. Physics simulation, road trips, real costs.

Navigation
All brandsCar duelRunning costsMotorwayMethodology
Simulators
Motorway simulatorRunning costsPerformance duel
Brands
VolkswagenBMWMercedesToyotaTeslaAudi
FRENDEESIT
© 2026 Caralogy · All rights reserved
  1. Home
  2. /Consumption
  3. /Sports Cars
i8PHEVvs840iPetrol
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • Specsi8 · 840i

BMW i8 Coupe I12 vs BMW 840i Convertible G15: 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 · 2018 vs 2020 · 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

ABMW i8 Coupe I12

Comparison unavailable - manufacturer data being validated.

GapComparison unavailable - manufacturer data being validated.
BBMW 840i Convertible G15

2,571 €per year

7,9 L/100 km weighted · 17.14 € per 100 km · 1 185 L per year

What produces these figures

WLTP combined
100.0 kWh/100 km · 7.5 L/100 km
Powertrain
Plug-in hybrid · Combustion
Power
374 ch · 333 ch
Kerb weight
1,535 kg · 1,840 kg

Other similar comparisons

PorscheVSBMW

Panamera vs 840i Convertible

gap 885 €/year
BMWVSPorsche

840i Convertible vs Panamera 4

gap 885 €/year
BMWVSPorsche

840i Convertible vs Panamera 4 Sport Turismo

gap 998 €/year
BMWVSPorsche

840i Convertible vs Panamera

gap 2 146 €/year

Frequently asked questions

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