Big bump I know, but... How are you getting those MPG figures? I have a virtually identical car (only the '02 estate version) and the most I can get out of it on a run is about 63mpg UK. Maybe a little more if I wasn't commuting in rush hour traffic. Granted it's winter at the moment, so it's cold, windy and dark (ergo headlights), but still. However, I have noticed that my trip computer seems pretty much dead on accurate.
Also, what are you using to do the remapping? More power could be useful for me, I'm eyeing up the towball fitting on mine and wondering about towing something race car shaped.
Bonus muddy glamour shot:
