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718Petrolvs430dHybrid
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  • Specs718 · 430d

Porsche 718 Boxster vs BMW 430d Convertible G22: 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 2021 · 15,000 km/an · Mixed · Petrol 95 2.17 €/L · Diesel 2.38 €/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 718 Boxster

3,236 €per year

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

Gap1,001 € per yearin favour of the 430d Convertible (−31 %)≈ 461 L petrol 95
BBMW 430d Convertible G22

2,235 €per year

6,3 L/100 km weighted · 14.90 € per 100 km · 941 L per year

The verdict changes with your usage
ProfileSplitAA · 718BB · 430dGap
City70 / 25 / 570 % city · 25 % road · 5 % motorway3,486 €2,497 €990 € · 430d
Mixed30 / 50 / 2030 % city · 50 % road · 20 % motorway3,236 €2,235 €1,001 € · 430d
Long-distance10 / 40 / 5010 % city · 40 % road · 50 % motorway3,008 €2,031 €976 € · 430d

Cumulative saving for the 430d Convertible

1 year
1,001 €
3 years
3,003 €
5 years
5,005 €
10 years
10,009 €

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

What produces these figures

WLTP combined
9.8 L/100 km · 6.0 L/100 km
Powertrain
Combustion · Mild hybrid 48 V
Power
300 ch · 286 ch
Kerb weight
1,335 kg · 1,880 kg

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Frequently asked questions

On a 100 km mixed trip, the BMW 430d Convertible is about 30% cheaper than the Porsche 718 Boxster with default parameters. This ratio shifts with your actual energy prices - simulate for your profile.

The BMW 430d Convertible is cheaper across all distances with default rates. If your energy prices differ significantly, simulate to see the real impact on your budget.