Lately my car is getting horriable gas milage I calculated I should be getting about 520km on one tank and I'm actually getting closer to 400km give or take! Anyone got suggestions? Probally will change the plugs that should help a tad.... I'm thinking it's my Cam sensor still even though I took it out and cleaned it up I'm still getting the fault code! The damn thing is eating at my catalitic convertor... could this be the main source of the problem?