Since the weather has turned cold my Lesabre mileage has dropped from 30 to
23 MPG Highway and from 22 to 16 MPG in town. The dealer recently replaced the Air mass senor, fuel regulator, air filter and cleaned the fuel induction system. They can't find anything else wrong. I was getting 30 highway and 22 in town. They said that it was normal for the mileage to go down in the cold weather that until the engine warmed up to 195 it would get poor mileage. The temperature never gets above 187 and normally is about 180 and that's after one or more hours of continuous driving .Any suggestions. The temperature averages about 20 degrees lately.
Thanks Bill