On a 100 km mixed trip, the Audi A4 40 TDI and BMW 420d Convertible have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.
Consumption comparison
Same car, two powertrains. The simulator below calculates the gap based on your mileage and charging type.
1 553 €per year
4,6 L/100 km weighted · 10,35 € per 100 km · 692 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 | A4 40 | 420d | Gap | Advantage |
|---|---|---|---|---|---|
| City | 70 % city · 25 % road · 5 % motorway | 1 849 € | 1 631 € | 218 € | 420d |
| Mixed | 30 % city · 50 % road · 20 % motorway | 1 655 € | 1 553 € | 102 € | 420d |
| Long-distance | 10 % city · 40 % road · 50 % motorway | 1 504 € | 1 499 € | 5 € | Nearly level |
On a 100 km mixed trip, the Audi A4 40 TDI and BMW 420d Convertible have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.
The BMW 420d Convertible is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.