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420ivs218iPetrol
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  • ConsumptionConsumptionYearly cost
  • Specs420i · 218i

BMW 420i Convertible G22 vs BMW 218i Convertible F22: 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 2018 · 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 420i Convertible G22

2,067 €per year

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

Gap146 € per yearin favour of the 420i Convertible (−7 %)≈ 68 L petrol 95
BBMW 218i Convertible F22

2,213 €per year

6,8 L/100 km weighted · 14.76 € per 100 km · 1 020 L per year

The verdict changes with your usage
ProfileSplitAA · 420iBB · 218iGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway2,270 €2,466 €195 € · 420i
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,067 €2,213 €146 € · 420i
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway1,914 €2,021 €107 € · 420i

Cumulative saving for the 420i Convertible

1 year
146 €
3 years
439 €
5 years
732 €
10 years
1,465 €

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

What produces these figures

WLTP combined
6.1 L/100 km · 6.5 L/100 km
Powertrain
Combustion · Combustion
Power
184 ch · 136 ch
Kerb weight
1,690 kg · 1,500 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 420i Convertible and BMW 218i 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.