On a 100 km mixed trip, the BMW 420i Convertible is about 50% cheaper than the Porsche Boxster S PDK with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.
Consumption comparison
Same car, two powertrains. The simulator below calculates the gap based on your mileage and charging type.
1 936 €per year
6,3 L/100 km weighted · 12,91 € per 100 km · 953 L per year
Cheaper to runAnnual mileage
15 000 km/an
Simulated driving mix
Drag anywhere on the bar to adjust
Fuel price
Petrol 95 : 2,03 €/L·Diesel : 2,25 €/L
prix-carburants.gouv.fr — moyenne nationale du 25/08/2026 ; EDF Tarif Bleu Base au 01/08/2026 ; DC autoroute : moyenne des réseaux sans abonnement
| Profile | Split | Boxster | 420i | Gap | Advantage |
|---|---|---|---|---|---|
| City | 70 % city · 25 % road · 5 % motorway | 5 172 € | 2 127 € | 3 045 € | 420i |
| Mixed | 30 % city · 50 % road · 20 % motorway | 3 897 € | 1 936 € | 1 961 € | 420i |
| Long-distance | 10 % city · 40 % road · 50 % motorway | 3 156 € | 1 793 € | 1 363 € | 420i |
On a 100 km mixed trip, the BMW 420i Convertible is about 50% cheaper than the Porsche Boxster S PDK with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.
The BMW 420i Convertible is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.