Many, many years ago we had real 100% leather seats. The we had "leather seating surfaces", which meant only the parts of seat that your butt, back and thighs touched were leather. The rest were a high quality vinyl that was indistinguishable from the real leather.
Now the have "leather trimmed" seats. I am sure that means even fewer square inches of leather are actually used in the seat cover. Does anyone know what parts of "leather trimmed" seats are actually leather ?