9-3 fuel consumption problem after 96k km service

Hello, I just had the 96 000 km service on my 2002 9-3 (5 doors). They change all the oils, filters and spark plugs on the car. Also I have changed the battery because it was dying on me.

Before the service I was averaging 7.5 l / 100 km on the highways and

10 l / 100 km in the city. I do a bit more highway then city roads like 60/40. With a full tank I was able to do 550 - 650 km ... 700km if I was lucky

Since the service, my fuel consumption way up. I'm averaging 10 l /

100km on higheways and 14 l / 100 km in the city and went from 550 - 650 km to 400 - 500km with a full tank. I didn't change my driving habits.

I'm not a mechanics but I was wondering if the ECU will adjust the fuel consumption by it self. Do I need to get it programmed? By replacing the battery have I unprogram something.

Any help would be appreciated.

Season Greetings to all Saab lovers.