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M550dDieselvs120iPetrol
  • MotorwayMotorwayRange and charging
  • PerformancePerformance0-100, top speed
  • ConsumptionConsumptionYearly cost
  • SpecsM550d · 120i

BMW M550d xDrive G30 vs BMW 120i F20LCI: 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.

grand tourer · 2018 vs 2018 · 15,000 km/an · Mixed · Diesel 2.38 €/L · 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 M550d xDrive G30

2,445 €per year

6,9 L/100 km weighted · 16.30 € per 100 km · 1 029 L per year

Gap381 € per yearin favour of the 120i (−16 %)≈ 160 L diesel
BBMW 120i F20LCI

2,064 €per year

6,3 L/100 km weighted · 13.76 € per 100 km · 951 L per year

The verdict changes with your usage
ProfileSplitAA · M550dBB · 120iGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway2,687 €2,249 €438 € · 120i
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,445 €2,064 €381 € · 120i
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway2,260 €1,927 €333 € · 120i

Cumulative saving for the 120i

1 year
381 €
3 years
1,144 €
5 years
1,906 €
10 years
3,812 €

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

What produces these figures

WLTP combined
6.6 L/100 km · 6.1 L/100 km
Powertrain
Combustion · Combustion
Power
400 ch · 184 ch
Kerb weight
1,845 kg · 1,375 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 120i is about 15% cheaper than the BMW M550d xDrive with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

The BMW 120i is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.