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AModelBEVvsB718Petrol
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  • SpecsModel · 718

Tesla Model S P85D vs Porsche 718 Cayman

Trip mapped at a glance. Charging stops visible, total duration predictable. Caralogy simulation at 130 km/h.

grand tourer · 2014 vs 2018 · Paris → Marseille · 775 km · 130 km/h
TeslaBEV

Model S P85D

691 ch · 77.5 kWh · 2014

VS
PorschePetrolPlus rapide

718 Cayman

300 ch · 2018

Simulation trip
Assumptions: 130 km/h · start 100 % · mild weather

Result · total trip time

ATesla Model S P85D

8h02charging included

4 stops · 79.10 €

Gap41 minin favour of 718 Cayman
BPorsche 718 Cayman

7h21charging included

4 stops · 470.89 €

Paris → Marseille · 130 km/h · Caralogy simulation
MeasureModel S P85D718 CaymanGap
Total time8h027h2141 min · 718 Cayman
Charging stops4 stops4 stopsSame
Cost of energy used79.10 €470.89 €391.79 € · Model S P85D

Visualise the trip

Both vehicles drive at 130 km/h. The difference comes from charging stops.

TeslaBEV
Model S P85D
100%
337 km
Range
Paris
0 km · departure
Charge 1
16 min · +31 kWh · 18.60 €
Charge 2
16 min · +31 kWh · 18.60 €
Charge 3
16 min · +31 kWh · 18.60 €
Charge 4
12 min · +22 kWh · 13.49 €
Marseille
775 km · Arrival 8h02
4
Stops
8h02
Duration
79.10 €
Cost of energy used
PorschePetrolFastest
718 Cayman
100%
174 km
Range
Paris
0 km · departure
Refuel 1
5 min · +49 L · 105.72 €
Refuel 2
5 min · +49 L · 105.72 €
Refuel 3
5 min · +49 L · 105.72 €
Refuel 4
5 min · +49 L · 105.72 €
Marseille
775 km · Arrival 7h21
4
Stops
7h21
Duration
470.89 €
Cost of energy used

The 41-minute lead of the 718 Cayman (combustion) comes from not needing a charging stop: 4 stops totalling 20 min versus 4 stops totalling 61 min for the Model S P85D (electric).

Both vehicles drove at 130 km/h for the entire trip. The 718 Cayman (combustion) makes 4 stops totalling 20 min, the Model S P85D (electric) 4 stops totalling 61 min. Road safety reminder: on a trip of this duration, it is recommended to stop for at least 68 min total (17 min every 2h). The energy cost is 79,10 € for Model S P85D versus 470,89 € for 718 Cayman.

Motorway consumption: the Caralogy methodology

The official WLTP figures (22,5 kWh/100km for Model S P85D and 9,8 L/100km for 718 Cayman) are measured on a mixed cycle averaging ~46 km/h. At a steady 130 km/h, aerodynamic drag weighs much more heavily - it grows with the square of speed. Caralogy calculates a motorway consumption specific to each vehicle based on its aerodynamic profile (SCx), weight and power curve - not a uniform correction factor. For this trip, the simulation yields 23,0 kWh/100km (Model S P85D) and 28,0 L/100km (718 Cayman). Full methodology: see the assumptions below the controls.

What about a 200 km round trip?

On a 200 km round trip (e.g. a weekend getaway), the electric or plug-in hybrid vehicle completes the entire journey on home energy at 0.20 €/kWh - with no charging stop. The time advantage of the combustion car on long-distance motorways disappears entirely, and the economic advantage of electric strengthens considerably.

Energy cost breakdown for your trip Paris → Marseille

The cost per kilometre depends on the electricity rate applied to each segment - based on the energy source used at that point of the trip.

Tesla Model S P85D

SegmentEnergy usedDistanceConsumption€/kmCost (€)
Paris → Tournus, A6initial energy charged at home · 0.20 €/kWh303 km70 kWh consumed0.046 €/km13.96 €
Tournus, A6 → Limonest, A6energy charged at Supercharger 116 kW · 0.60 €/kWh135 km31 kWh consumed0.138 €/km18.60 €
Limonest, A6 → Montélimar, A7energy charged at Supercharger 116 kW · 0.60 €/kWh135 km31 kWh consumed0.138 €/km18.60 €
Montélimar, A7 → Manosque, A51energy charged at Supercharger 116 kW · 0.60 €/kWh135 km31 kWh consumed0.138 €/km18.60 €
Manosque, A51 → Marseilleenergy charged at Supercharger 112 kW · 0.60 €/kWh68 km16 kWh consumed0.137 €/km9.35 €
Trip total79.10 €

Porsche 718 Cayman

SegmentEnergy usedDistanceConsumption€/kmCost (€)
Paris → Auxerre, A6fuel · 2.17 €/L174 km49 L consumed0.608 €/km105.72 €
Auxerre, A6 → Tournus, A6fuel · 2.17 €/L174 km49 L consumed0.608 €/km105.72 €
Tournus, A6 → Valence, A7fuel · 2.17 €/L174 km49 L consumed0.608 €/km105.72 €
Valence, A7 → Manosque, A51fuel · 2.17 €/L174 km49 L consumed0.608 €/km105.72 €
Manosque, A51 → Marseillefuel · 2.17 €/L79 km22 L consumed0.608 €/km48.02 €
Trip total470.89 €

Range recovered by stop duration

How many kilometres do you recover depending on the time spent at the charger? Comparison at nominal peak power.
Charging stop durationTesla Model S P85DPorsche 718 Cayman
5 minutes~30 km-
10 minutes~61 km-
20 minutes~122 km-
Full session 10 → 80 %~236 km · 42 min-

What produces these figures

WLTP combined consumption
22.5 kWh/100 km · 9.8 L/100 km

Compare with another vehicle

Replace one of the two with an alternative from the same segment

TeslaBEV

Model S P85D

691 ch · 77.5 kWh · 2014

PorschePetrol

718 Cayman

300 ch · 2018

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Frequently asked questions

The advantage comes from the combo real range + charging speed. On Paris → Marseille (775 km at 130 km/h), the 718 Cayman arrives in 7h21 with 4 fuel stops.

WLTP consumption does not reflect motorway reality. Aerodynamic drag grows with the square of speed, so real consumption is 15 to 25 % higher than WLTP combined. Caralogy calculates a highway consumption specific to each vehicle based on its aerodynamic profile (SCx), weight and power curve.

Total time = driving time + charging time. Driving time is calculated at an average speed of 130 km/h on the motorway (adjustable). Charging time is calculated based on the real power curve of each vehicle, respecting the optimal 10 → 80 % range and the maximum power accepted by the chargers on the route.

No. The displayed cost covers only the energy consumed during the trip: kWh × energy rate, with a mix of home charging and DC fast chargers. Battery wear is a long-term ownership cost, not a trip cost.

On this trip, the energy used costs 79.10 € (Model S P85D) and 470.89 € (718 Cayman). For reference, an equivalent BMW 530i (~8.0 L/100 km) would cost about 115 € in fuel.