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M140iPetrolvs420dDiesel
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • SpecsM140i · 420d

BMW M140i xDrive F20LCI vs BMW 420d 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.

compact · 2018 vs 2021 · 15,000 km/an · Mixed · Petrol 95 2.17 €/L · Diesel 2.38 €/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 M140i xDrive F20LCI

2,731 €per year

8,4 L/100 km weighted · 18.21 € per 100 km · 1 258 L per year

Gap1,088 € per yearin favour of the 420d Convertible (−40 %)≈ 501 L petrol 95
BBMW 420d Convertible G22

1,643 €per year

4,6 L/100 km weighted · 10.95 € per 100 km · 692 L per year

The verdict changes with your usage
ProfileSplitAA · M140iBB · 420dGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,063 €1,725 €1,338 € · 420d
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,731 €1,643 €1,088 € · 420d
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway2,477 €1,586 €891 € · 420d

Cumulative saving for the 420d Convertible

1 year
1,088 €
3 years
3,264 €
5 years
5,440 €
10 years
10,879 €

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

What produces these figures

WLTP combined
8.0 L/100 km · 4.5 L/100 km
Powertrain
Combustion · Combustion
Power
340 ch · 190 ch
Kerb weight
1,540 kg · 1,775 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 420d Convertible is about 40% cheaper than the BMW M140i xDrive with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

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.