By my math, you're losing out on around $400 worth of supercharging or $107 of charging at home.
For the LR AWD, you get around 495KM on 75kW. That works out to 6.6km/kW. With 7,500km that's around 1,136 kW. The superchargers will do 72kW/hr so at $0.44 tier 1 rate, that's around $0.36/kWh...