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S5vs840iPetrol
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  • SpecsS5 · 840i

Audi S5 Avant vs BMW 840i Convertible G15: 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.

saloon · 2026 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

AAudi S5 Avant

2,526 €per year

7,8 L/100 km weighted · 16.84 € per 100 km · 1 164 L per year

Gap19 € per yearin favour of the S5 Avant (−1 %)≈ 9 L petrol 95
BBMW 840i Convertible G15

2,545 €per year

7,8 L/100 km weighted · 16.97 € per 100 km · 1 173 L per year

The verdict changes with your usage
ProfileSplitAA · S5BB · 840iGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway2,585 €2,833 €249 € · S5
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway2,526 €2,545 €Nearly level
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway2,409 €2,321 €88 € · 840i

Cumulative saving for the S5 Avant

1 year
19 €
3 years
58 €
5 years
97 €
10 years
195 €

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

What produces these figures

WLTP combined
8.0 L/100 km · 7.5 L/100 km
Powertrain
Combustion · Combustion
Power
367 ch · 340 ch
Kerb weight
1,965 kg · 1,830 kg

Other similar comparisons

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M340i xDrive vs S5 Avant

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840i Convertible vs Panamera

gap 920 €/year
BMWVSAudi

M340i xDrive Touring vs S5 Avant

gap 91 €/year
BMWVSPorsche

840i Convertible vs Panamera 4

gap 920 €/year

Frequently asked questions

On a 100 km mixed trip, the Audi S5 Avant and BMW 840i Convertible have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.

The Audi S5 Avant is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.