Ive posed a while back sain that the car take alot of gas and there are so many posts over here to use seafoam, check tirepressure, air filter, all of that well ive done that all, i had a bad ks changed that as well no codes nice and clean ecu, and the gas consumption is still about 15-15.5 mpg but seafoam did help with performace the car started perfoming like a brand new. I personaly dont know what the problem could be and this is noraml driving no hard acceleration or anything like that. what else can be the problem ?

 

Check your engine coolant temp sensor. Make sure it's within spec using an ohm meter. O2 sensors play a big role in your fuel economy as well. The front ones read your O2 levels and adjust a/f to give good performance and economy. They wear out slowly over time and can give incorrect readings back to your ECU which might not cause an error code, but can cause poor performance and gas mileage.