I have a P5, so its 2.0
and your right, the fuel economy on it isn't that great but still not totally terrible. I would say though that it consumes about 1.5x what my hatch consumed.
my sister has the 1.8 engine in her Protege with Autotragic, the car barely gets over 450 km on a 45 or 50L tank. She hates that POS and the famous Mazda's rust problems