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  • Specs911 · Boxster

Porsche 911 Carrera GTS Cabriolet 991.1 vs Porsche Boxster Spyder: 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 · 2015 vs 2012 · 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 GTS Cabriolet 991.1

3,880 €per year

11,9 L/100 km weighted · 25.87 € per 100 km · 1 788 L per year

Gap284 € per yearin favour of the 911 Carrera GTS Cabriolet (−7 %)≈ 131 L petrol 95
BPorsche Boxster Spyder

4,164 €per year

12,8 L/100 km weighted · 27.76 € per 100 km · 1 919 L per year

The verdict changes with your usage
ProfileSplitAA · 911BB · BoxsterGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway4,258 €5,342 €1,084 € · 911
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway3,880 €4,164 €284 € · 911
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway3,515 €3,429 €Nearly level

Cumulative saving for the 911 Carrera GTS Cabriolet

1 year
284 €
3 years
852 €
5 years
1,420 €
10 years
2,839 €

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

What produces these figures

WLTP combined
11.8 L/100 km · 10.7 L/100 km
Powertrain
Combustion · Combustion
Power
480 ch · 324 ch
Kerb weight
1,495 kg · 1,275 kg

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Frequently asked questions

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

The Porsche 911 Carrera GTS Cabriolet is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.