1991 200 20v poor gas mileage...

[Peter Schulz <schulz@tif623.ed.ray.com>]

Folks:

I need seem help in solving a problem with the 200 20v Wagon.
Car has 142k miles.

For the least 2 months or so, average gas mileage (mpg) has dropped
from 24 to about 20, for mixed driving, sometimes as low as 19.

I tend to drive with a light foot, for the most part.

Things that have been replaced on the car since I bought it last
year:

Plugs (platins), air filter, crankcase breather hose, cap & correct
rotor for the 3B engine, timing belt and water pump and O2 sensor.

I also ran a bottle of techron and run Mobil 1 15w50  with changes
every 4k miles.

Power seems ok, engine will pull 1.7 bar.

Ideas?

Thanks!
-Peter Schulz
1991 200 20v TQW
1990 CQ
Chelmsford, MA USA
schulz@res.ray.com