BMWPetrol
840i Convertible G15
333 ch · 2021
Trip mapped at a glance. Charging stops visible, total duration predictable. Caralogy simulation at 130 km/h.
| Measure | 840i Convertible G15 | Q7 SUV | Gap |
|---|---|---|---|
| Total time | 7h01 | 7h06 | 5 min · 840i Convertible G15 |
| Charging stops | 0 stops | 1 stop | 1 stop · 840i Convertible G15 |
| Cost of energy used | 104.27 € | 176.58 € | 72.31 € · 840i Convertible G15 |
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 1 stop of 5 min for the Q7 SUV.
The official WLTP figures (7,5 L/100km for 840i Convertible G15 and 8,4 L/100km for Q7 SUV) 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 10,5 L/100km (Q7 SUV). Full methodology: see the assumptions below the controls.
| Segment | Energy used | Distance | Consumption | €/km | Cost (€) |
|---|---|---|---|---|---|
| Paris → Marseille | fuel · 2.17 €/L | 775 km | 48 L consumed | 0.135 €/km | 104.27 € |
| Trip total | 104.27 € |
| Segment | Energy used | Distance | Consumption | €/km | Cost (€) |
|---|---|---|---|---|---|
| Paris → Montélimar, A7 | fuel · 2.17 €/L | 643 km | 68 L consumed | 0.228 €/km | 146.47 € |
| Montélimar, A7 → Marseille | fuel · 2.17 €/L | 132 km | 14 L consumed | 0.228 €/km | 30.11 € |
| Trip total | 176.58 € |
Replace one of the two with an alternative from the same segment
333 ch · 2021
231 ch · 2026
On Paris → Marseille (775 km at 130 km/h), the 840i Convertible G15 arrives in 7h01 with 0 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 104.27 € (840i Convertible G15) and 176.58 € (Q7 SUV). For reference, an equivalent Mercedes S 450 (~9.0 L/100 km) would cost about 129 € in fuel.