Tell me about it, car parking bays should be a standard 2.4m x 4.8m, this is the standard they should be designed to, many supermarkets amend these sizes to as little as 2.1m x 4m to squeeze as many parking bays as possible in, this leaves little room to open doors and leaves many bigger cars entirely filling a space widthwise, and overhang the ends of the spaces, I know your pain as I drive a volvo estate - these used to be a big car, though even a mini nowadays is taller and nearly as wide and as long (and minis used to be a tiny car).
at 2.05m x 4.71m my volvo should fit into a standard parking bay, but in supermarkets I usually seem to be hanging 0.3m out of a parking bay.