BMWPetrol
840i Convertible G15
333 ch · 2021
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
| 840i Convertible G15 | Boxster 981 | |
|---|---|---|
| Total time | 7h01−15 min | 7h16 |
| Charging stops | 0 stops−3 stops | 3 stops |
| Total cost | 95,62 €−320,79 € | 416,41 € |
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 840i Convertible G15 versus 3 stops totalling 15 min for the Boxster 981.
The official WLTP figures (7,5 L/100km for 840i Convertible G15 and 10,7 L/100km for Boxster 981) 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 6,2 L/100km (840i Convertible G15) and 27,0 L/100km (Boxster 981). 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 → Marseillefuel · 1,99 €/L | 775 km48 L consumed | 0,123 €/km | 95,62 € |
| Trip total | 95,62 € | ||
| Segment | Distance | €/km | Cost |
|---|---|---|---|
| Paris → Beaune, A6fuel · 1,99 €/L | 213 km58 L consumed | 0,538 €/km | 114,58 € |
| Beaune, A6 → Limonest, A6fuel · 1,99 €/L | 213 km58 L consumed | 0,538 €/km | 114,58 € |
| Limonest, A6 → Montélimar, A7fuel · 1,99 €/L | 213 km58 L consumed | 0,538 €/km | 114,58 € |
| Montélimar, A7 → Marseillefuel · 1,99 €/L | 135 km37 L consumed | 0,538 €/km | 72,68 € |
| Trip total | 416,41 € | ||
Replace one of the two with an alternative from the same segment
333 ch · 2021
259 ch · 2012
On Paris → Marseille (775 km at 130 km/h), the 840i Convertible G15 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: 95,62 € (840i Convertible G15) and 416,41 € (Boxster 981). An equivalent petrol SUV (~8 L/100 km) would cost about 115 € in motorway fuel. Electric costs less in energy but adds charging stops.