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  • Specs911 · Boxster

Porsche 911 Carrera 4S Cabriolet 991.2 vs Porsche Boxster: 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 2010 · 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

Gap173 € per yearin favour of the Boxster (−5 %)≈ 80 L petrol 95
BPorsche Boxster

3,327 €per year

10,2 L/100 km weighted · 22.18 € per 100 km · 1 533 L per year

The verdict changes with your usage
ProfileSplitAA · 911BB · BoxsterGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,833 €3,644 €189 € · Boxster
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway3,499 €3,327 €173 € · Boxster
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway3,164 €3,020 €144 € · Boxster

Cumulative saving for the Boxster

1 year
173 €
3 years
518 €
5 years
863 €
10 years
1,725 €

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

What produces these figures

WLTP combined
10.7 L/100 km · 10.1 L/100 km
Powertrain
Combustion · Combustion
Power
426 ch · 259 ch
Kerb weight
1,560 kg · 1,365 kg

Other similar comparisons

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911 Carrera 4S Cabriolet vs Z4 M40i

gap 1 315 €/year
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gap 1 688 €/year
PorscheVSBMW

911 Carrera 4S Cabriolet vs Z4 M40i

gap 1 384 €/year
PorscheVSBMW

Boxster vs Z4 sDrive30i

gap 1 723 €/year

Frequently asked questions

On a 100 km mixed trip, the Porsche 911 Carrera 4S Cabriolet and Porsche Boxster have a near-identical cost per km with default parameters. The gap becomes significant once you enter your actual energy prices.

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