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M140ivs420iPetrol
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • SpecsM140i · 420i

BMW M140i F20LCI vs BMW 420i F32: 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 2020 · 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 M140i F20LCI

2,536 €per year

7,8 L/100 km weighted · 16.90 € per 100 km · 1 169 L per year

Gap563 € per yearin favour of the 420i (−22 %)≈ 260 L petrol 95
BBMW 420i F32

1,973 €per year

6,1 L/100 km weighted · 13.15 € per 100 km · 909 L per year

The verdict changes with your usage
ProfileSplitAA · M140iBB · 420iGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway2,868 €2,194 €674 € · 420i
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,536 €1,973 €563 € · 420i
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway2,282 €1,803 €478 € · 420i

Cumulative saving for the 420i

1 year
563 €
3 years
1,689 €
5 years
2,816 €
10 years
5,631 €

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

What produces these figures

WLTP combined
7.4 L/100 km · 5.8 L/100 km
Powertrain
Combustion · Combustion
Power
340 ch · 184 ch
Kerb weight
1,470 kg · 1,525 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 420i is about 20% cheaper than the BMW M140i with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

The BMW 420i is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.