Probably the sensor in the battery says it’s 10c rather than 0 so the computer works out more range.you had suggested overnight temperature was the issue increasing the range which he had thought unlikely/refuted ..
and not been aware/suggested a more likely explanation revealed in a few seconds study on the internet - pretty sure it has never been discussed on this thread either..
( to wit. in B&W leaving the charge available to the car to allow it to balance the cells, for a period beyond the required charge level)