HORRIBLE GAS MILAGE HELP!!!!!!!!!!!!!!!!!!!

[desi_prodigy]

hi how are u guys doing,,i have a 1998 Caravan 3.0L base model,,and this thing is giving me horrible gas all of a sudden,,so i got a tune up,,got my spark plugz,,wires,,air filter, fuel filter,throttle body fuel injector service and front o2 sensor,,and still its sucks in gas,,i got some power back,,but its still horrible on gas,,on a full tank i get about 350KM,,its pissing me off,,i dont even drive rough i alwayz use to get about 500,,520,,now i only get 350KM on a full tank,,theres no leak in the tank or ntohing,,HELP MEE

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[big_Gymnast]

My first question would be is it using any oil, because if it is, then you may have the infamous valve guide issue that so many of us with the 3.0L have had in the past.[:@] I would also check the EGR valve, if the 3.0L has one...I dont remember if it does or not, but when the EGR went in our 3.3L our mileage dropped like a rock. Thats where I would look. Good Luck