4 kml is petrol mileage, diesel versions were better. but then again, driving locality makes a difference.
The thing with these old automatics is that they have a certain adjustment and technique required to drive them. They will always be 2kml less than the manual but 4 is too low.
A cruiser of the same age, does 8.5 local in manual and 7 local in auto, this shouldn't be any difference