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911vs718Petrol
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  • Specs911 · 718

Porsche 911 Carrera 4S Cabriolet 991.2 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.

sports car · 2017 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

APorsche 911 Carrera 4S Cabriolet 991.2

3,499 €per year

10,8 L/100 km weighted · 23.33 € per 100 km · 1 613 L per year

Gap792 € per yearin favour of the 911 Carrera 4S Cabriolet (−18 %)≈ 365 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 · 911BB · 718Gap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,833 €5,394 €1,561 € · 911
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway3,499 €4,291 €792 € · 911
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway3,164 €3,608 €444 € · 911

Cumulative saving for the 911 Carrera 4S Cabriolet

1 year
792 €
3 years
2,375 €
5 years
3,958 €
10 years
7,915 €

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

What produces these figures

WLTP combined
10.7 L/100 km · 11.2 L/100 km
Powertrain
Combustion · Combustion
Power
426 ch · 365 ch
Kerb weight
1,560 kg · 1,375 kg

Other similar comparisons

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911 Carrera 4S Cabriolet vs Z4 M40i

gap 1 315 €/year
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718 Boxster GTS vs Z4 M40i

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PorscheVSBMW

911 Carrera 4S Cabriolet vs Z4 M40i

gap 1 384 €/year
PorscheVSBMW

718 Boxster GTS vs Z4 M40i

gap 2 440 €/year

Frequently asked questions

On a 100 km mixed trip, the Porsche 911 Carrera 4S Cabriolet 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 Porsche 911 Carrera 4S Cabriolet is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.