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  • SpecsM4 · 718

BMW M4 Convertible F82 vs Porsche 718 Boxster GTS: 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 · 2018 vs 2018 · 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 M4 Convertible F82

3,486 €per year

10,7 L/100 km weighted · 23.24 € per 100 km · 1 607 L per year

Gap805 € per yearin favour of the M4 Convertible (−19 %)≈ 371 L petrol 95
BPorsche 718 Boxster GTS

4,291 €per year

13,2 L/100 km weighted · 28.60 € per 100 km · 1 977 L per year

The verdict changes with your usage
ProfileSplitAA · M4BB · 718Gap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,911 €5,394 €1,483 € · M4
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway3,486 €4,291 €805 € · M4
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway3,164 €3,608 €444 € · M4

Cumulative saving for the M4 Convertible

1 year
805 €
3 years
2,414 €
5 years
4,023 €
10 years
8,045 €

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

What produces these figures

WLTP combined
10.2 L/100 km · 11.2 L/100 km
Powertrain
Combustion · Combustion
Power
431 ch · 365 ch
Kerb weight
1,790 kg · 1,375 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW M4 Convertible is about 20% cheaper than the Porsche 718 Boxster GTS with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

The BMW M4 Convertible is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.