My car has the dreaded porous head/gasket I believe. (Rough start up kicking out white smoke, losing coolant). So I chucked some kseal in and think im gonna sell it soon! Anyway until then Im not happy because its costing me so much to run! Combined MPG is about 30-36 which I have researched and although not unseen it should be getting much more. I had my mate plug it in to read codes and only faults which came up were rear wheel abs sensor faulty, cylinder problems (guessing that's the head problem) and a radiator fan fault. Tbh I don't really want to spend much more money investigating things on it but anyone know what could be causing the dire mpg? Tyres correct psi, air filter clean had service about 2 months ago.