PorschePetrol
Cayman (PDK) 987
269 ch · 2011
Motorway range comparison
Trip mapped at a glance. Charging stops visible, total duration predictable. Caralogy simulation at 130 km/h.
Paris → Marseille · 130 km/h · Caralogy simulation
| Cayman (PDK) 987 | 420d Convertible G22 | |
|---|---|---|
| Total time | 7h06 | 7h01−5 min |
| Charging stops | 1 stop | 0 stops−1 stop |
| Total cost | 167,42 € | 67,75 €−99,67 € |
Both vehicles drive at 130 km/h. The difference comes from charging stops.
Analysis
Both vehicles drove at 130 km/h for the entire trip. The gap is built at the stops: no stop for the 420d Convertible G22 versus 1 stop of 5 min for the Cayman (PDK) 987.
The official WLTP figures (10,1 L/100km for Cayman (PDK) 987 and 4,5 L/100km for 420d Convertible G22) 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 10,6 L/100km (Cayman (PDK) 987) and 4,3 L/100km (420d Convertible G22). Full methodology: see the dedicated button above the summary.
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.
| Segment | Distance | €/km | Cost |
|---|---|---|---|
| Paris → Valence, A7fuel · 2,03 €/L | 542 km58 L consumed | 0,216 €/km | 117,05 € |
| Valence, A7 → Marseillefuel · 2,03 €/L | 233 km25 L consumed | 0,216 €/km | 50,37 € |
| Trip total | 167,42 € | ||
| Segment | Distance | €/km | Cost |
|---|---|---|---|
| Paris → Marseillefuel · 2,03 €/L | 775 km33 L consumed | 0,087 €/km | 67,75 € |
| Trip total | 67,75 € | ||
Replace one of the two with an alternative from the same segment
269 ch · 2011
190 ch · 2021
On Paris → Marseille (775 km at 130 km/h), the 420d Convertible G22 arrives in 7h01 with 0 stop.
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.
Electric: 167,42 € (Cayman (PDK) 987) and 67,75 € (420d Convertible G22). An equivalent petrol SUV (~8 L/100 km) would cost about 115 € in motorway fuel. Electric costs less in energy but adds charging stops.