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640iPetrolvs320dDiesel
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  • Specs640i · 320d

BMW 640i Gran Turismo G32 vs BMW 320d G20: 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 2024 · 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 640i Gran Turismo G32

2,666 €per year

8,2 L/100 km weighted · 17.77 € per 100 km · 1 229 L per year

Gap1,101 € per yearin favour of the 320d (−41 %)≈ 507 L petrol 95
BBMW 320d G20

1,565 €per year

4,4 L/100 km weighted · 10.43 € per 100 km · 659 L per year

The verdict changes with your usage
ProfileSplitAA · 640iBB · 320dGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,055 €1,652 €1,403 € · 320d
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,666 €1,565 €1,101 € · 320d
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway2,376 €1,497 €879 € · 320d

Cumulative saving for the 320d

1 year
1,101 €
3 years
3,304 €
5 years
5,506 €
10 years
11,012 €

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

What produces these figures

WLTP combined
7.7 L/100 km · 4.3 L/100 km
Power
340 ch · 190 ch
Kerb weight
1,770 kg · 1,540 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 320d is about 40% cheaper than the BMW 640i Gran Turismo with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

The BMW 320d is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.