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911vs718Petrol
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  • Specs911 · 718

Porsche 911 Carrera Cabriolet 991.2 vs Porsche 718 Cayman: 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 Cabriolet 991.2

3,340 €per year

10,3 L/100 km weighted · 22.26 € per 100 km · 1 539 L per year

Gap104 € per yearin favour of the 718 Cayman (−3 %)≈ 48 L petrol 95
BPorsche 718 Cayman

3,236 €per year

9,9 L/100 km weighted · 21.57 € per 100 km · 1 491 L per year

The verdict changes with your usage
ProfileSplitAA · 911BB · 718Gap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,650 €3,486 €164 € · 718
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway3,340 €3,236 €104 € · 718
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway3,030 €3,008 €Nearly level

Cumulative saving for the 718 Cayman

1 year
104 €
3 years
312 €
5 years
520 €
10 years
1,041 €

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

What produces these figures

WLTP combined
10.2 L/100 km · 9.8 L/100 km
Powertrain
Combustion · Combustion
Power
375 ch · 300 ch
Kerb weight
1,500 kg · 1,335 kg

Other similar comparisons

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911 Carrera Cabriolet vs Z4 M40i

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911 Carrera Cabriolet vs Z4 M40i

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BMWVSPorsche

Z4 M40i vs 718 Cayman

gap 964 €/year

Frequently asked questions

On a 100 km mixed trip, the Porsche 911 Carrera Cabriolet and Porsche 718 Cayman have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.

The Porsche 718 Cayman is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.