I do not have a Pointer manual for the moment because although I have one 2001 I have not needed it, the heating in the lower part of the car may be due to a covered catalytic converter (which could also increase the fuel consumption) or lack the isolation that originally brings in the lower part of the car, there are several factors for which it can consume more fuel, I suppose it is well tuned, if it is not so it begins by Spark plugs, Czech lid and rotor (from 2004 it is already DIS), the fact that the temperature sensor is very common in this car and increases consumption, if you do not know how to check sensors you can check it in the videos of Chuovy Group sensors of You Tube, if you do not give, the healthiest thing is to send it scan, luck.