if your map was fuggered, it would either not be reading enough boost and youd be running lean. or it would be stuck open and youd be overfueling something silly, im talknig 80 miles to a tank silly. with a smashed cat, youd be popping flames everywhere. i dont think its injectors because they tent to either stick open or closed. so youd be either mega fueling or no fuel. so i doubt its that. the car would run shit as well. so unless it is that extreme id look elsewhere. seriously, change your thermo, itll take you half ano hour and cost 12 quid. have you reset the ecu? they can work them selves up into a bit of a fuel loving mood sometimes due to the mild learning ability they have. give it a reset, and see what happens then. appart from the overfueling, is the car running any differently?