My Fairly used Mitsubishi Montero limited 2000 model has excess fuel consumption like 30litrs per 100km Accompany with very hot interior under the feet even with a c on though vehicle not doing overheating. Mechanics seems not to know the cause of the excess hotness & excessive fuel even when many news fittings changed including catalyst as suggested to no avail. Sensors have been removed & tested ok. Mechanics have confirmed engine running well & in superb form even from the sound of it. Am contemplating outright sale due to drain on my finance due to this issue. Please I need technical suggestions & practical help.