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430ivs420iPetrol
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  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • Specs430i · 420i

BMW 430i G22 vs BMW 420i Convertible G22: which is cheaper to run?

What each kilometre costs, depending on your driving profile and how you charge. Annual projection and cumulative savings over 10 years.

saloon · 2021 vs 2021 · 15,000 km/an · Mixed · Petrol 95 2.17 €/L · 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

Result · yearly energy cost

ABMW 430i G22

2,090 €per year

6,4 L/100 km weighted · 13.93 € per 100 km · 963 L per year

Gap23 € per yearin favour of the 420i Convertible (−1 %)≈ 10 L petrol 95
BBMW 420i Convertible G22

2,067 €per year

6,3 L/100 km weighted · 13.78 € per 100 km · 953 L per year

The verdict changes with your usage
ProfileSplitAA · 430iBB · 420iGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway2,337 €2,270 €Nearly level
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,090 €2,067 €Nearly level
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway1,907 €1,914 €Nearly level

Cumulative saving for the 420i Convertible

1 year
23 €
3 years
68 €
5 years
114 €
10 years
228 €

Energy only. Excludes purchase, insurance, servicing, depreciation.

What produces these figures

WLTP combined
6.1 L/100 km · 6.1 L/100 km
Powertrain
Combustion · Combustion
Power
258 ch · 184 ch
Kerb weight
1,545 kg · 1,690 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 430i and BMW 420i Convertible have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.

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.