Aller au contenu principal
CaralogyCaralogy
HomeBrandsRoad TripBudgetDuelGuides
Caralogy

The car comparison platform. Physics simulation, road trips, real costs.

Navigation
All brandsCar duelRunning costsMotorwayMethodology
Simulators
Motorway simulatorRunning costsPerformance duel
Brands
VolkswagenBMWMercedesToyotaTeslaAudi
FRDEESIT
© 2026 Caralogy · All rights reserved
Home›Consumption›BMW 420d vs BMW 120i

Consumption comparison

BMW 420d F32 vs BMW 120i F20LCI: how much do I save per year?

Same car, two powertrains. The simulator below calculates the gap based on your mileage and charging type.

BMWDieselMost economical

420d F32

59 L · 2020

4,2 L/100km

VS
BMWPetrol

120i F20LCI

52 L · 2018

6,1 L/100km

MotorwayRange & chargingPerformance0-100, top speedConsumptionAnnual TCO

Annual mileage

15 000 km/an

5 000 km50 000 km

Simulated driving mix

Drag anywhere on the bar to adjust

Fuel price

Petrol 95 : 1,99 €/L·Diesel : 1,75 €/L

Annual energy cost · 15 000 km

Typical annual usage : Mix 30% city / 50% road / 20% motorway

BMWPetrolMost economical

420d F32

Annual energy cost · 15 000 km

1 142€

7,61 € / 100 km

Equivalent to 574 L of petrol 95 per year

Weighted consumption
4,4 L/100km
Fuel price
1,75 €/L
Fuel used
652,5 L per year
BMWPetrol

120i F20LCI

Annual energy cost · 15 000 km

1 892€

12,62 € / 100 km

Equivalent to 951 L of petrol 95 per year

Weighted consumption
6,3 L/100km
Fuel price
1,99 €/L
Fuel used
951,0 L per year
Annual gap 420d vs 120i+751 €/an≈ 377 L petrol 95

BMW 420d F32 costs 751 €/an less in energy than BMW 120i F20LCI, over 15 000 km for this driving mix.

≈ 377 L of petrol 95 saved per year

Your savings over the ownership period

Cumulative projection by annual mileage. The cheaper-to-run vehicle widens the gap year after year.

Annual mileage

15 000 km/an

1 year

751 €

≈ 377 L petrol 95

3 years

2 252 €

≈ 1132 L petrol 95

5 years

3 753 €

≈ 1886 L petrol 95

10 years

7 506 €

≈ 3772 L petrol 95

Cumulative savings for BMW 420d F32 versus BMW 120i F20LCI. Excluding purchase, insurance, maintenance and depreciation.

Annual fuel cost breakdown

Projection over 15 000 km/year.

BMW

420d F32

Fuelkm/year€/kmAnnual cost
Annual fuel1,75 €/L15 000 km0,076 €/km1 142 €
BMW

120i F20LCI

Fuelkm/year€/kmAnnual cost
Annual fuel1,99 €/L15 000 km0,126 €/km1 892 €

Other similar comparisons

AudiVSBmw

A4 40 TDI vs 420d

AudiVSBmw

A3 allstreet vs 120i

VolvoVSBmw

S60 B4 vs 420d

AudiVSBmw

A3 Sedan vs 120i

Frequently asked questions

On a 100 km mixed trip, the BMW 420d is about 40% cheaper than the BMW 120i with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

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