BMWPetrol
M850i xDrive Convertible G15
530 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
| M850i xDrive Convertible G15 | Model 3 Performance | |
|---|---|---|
| Total time | 7h01−22 min | 7h23 |
| Charging stops | 0 stops−3 stops | 3 stops |
| Total cost | 121,32 € | 62,09 €−59,23 € |
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 M850i xDrive Convertible G15 (combustion) makes no stop, the Model 3 Performance (electric) 3 stops totalling 22 min. Road safety reminder: on a trip of this duration, it is recommended to stop for at least 51 min total (17 min every 2h). The energy cost is 121,32 € for M850i xDrive Convertible G15 versus 62,09 € for Model 3 Performance.
The official WLTP figures (10,1 L/100km for M850i xDrive Convertible G15 and 16,7 kWh/100km for Model 3 Performance) 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 7,7 L/100km (M850i xDrive Convertible G15) and 19,4 kWh/100km (Model 3 Performance). Full methodology: see the dedicated button above the summary.
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 0.18 €/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.
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 · 2,03 €/L | 775 km60 L consumed | 0,157 €/km | 121,32 € |
| Trip total | 121,32 € | ||
| Segment | Distance | €/km | Cost |
|---|---|---|---|
| Paris → Tournus, A6initial energy charged at home · 0,20 €/kWh | 362 km70 kWh consumed | 0,039 €/km | 14,05 € |
| Tournus, A6 → Valence, A7energy charged at Supercharger 234 kW · 0,60 €/kWh | 161 km31 kWh consumed | 0,116 €/km | 18,72 € |
| Valence, A7 → Manosque, A51energy charged at Supercharger 234 kW · 0,60 €/kWh | 161 km31 kWh consumed | 0,116 €/km | 18,72 € |
| Manosque, A51 → Marseilleenergy charged at Supercharger 235 kW · 0,60 €/kWh | 91 km18 kWh consumed | 0,117 €/km | 10,60 € |
| Trip total | 62,09 € | ||
How many kilometres do you recover depending on the time spent at the charger? Comparison at nominal peak power.
| Charging stop duration | BMW M850i xDrive Convertible G15 | Tesla Model 3 Performance |
|---|---|---|
| 5 minutes | - | ~75 km |
| 10 minutes | - | ~150 km |
| 20 minutes | - | ~301 km |
| Full session 10 → 80 % | - | ~282 km20 min |
Replace one of the two with an alternative from the same segment
530 ch · 2021
510 ch · 78 kWh · 2024
The advantage comes from the combo real range + charging speed. On Paris → Marseille (775 km at 130 km/h), the M850i xDrive Convertible G15 arrives in 7h01 with 0 charging 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: 121,32 € (M850i xDrive Convertible G15) and 62,09 € (Model 3 Performance). An equivalent petrol SUV (~8 L/100 km) would cost about 115 € in motorway fuel. Electric costs less in energy but adds charging stops.