My S 90D (2 months old, 90% charge is 250 miles), told me today; 90% charge should be 81kWh, so at this stage I should have used about 50% of the available battery power. However the range readout shows; 94 miles as a percentage of 250 miles, is 37%. When switching to the remaining battery power percentage display it says 34% which is in general agreement with the 37% from the miles calculation. Both of these values are a lot lower than the 50% I was hoping to see from the power used so far display. Can anyone explain the differences and which power remaining number I should really trust? Thanks from Northumberland, England.