I know about the 1984 cc. This is considered a 2.0 litre. There were older diesel engines at 1.9 litre.[hr]
My V40 D2, after 4400 kms, is showing 5.4 lt/100 kms, which equals 52.31 mpg. Mostly urban areas. Strange that consumption goes up instead of down, it started at less than 5.0 lt/100 kms (4.8) and it goes up as kms accumulate !