All,
My 1985 380SE would get 21 miles per gallon on the highway. It then started running like a dog and I was getting 8 miles per gallon. I have 173,000 miles on the car and replaced the O2 sensor. The car now runs great and sitting in the car you barely can tell the car is running - - it runs that smooth. The gas mileage has improved But, the car is not getting the mileage it use to and is now getting 14 miles per gallon. I do notice that when I drive the economy gauge on the dash seems to have the needle sitting in the middle while I drive. When the car is at a stop, the needle on the economy gauge is to the left. Any suggestions of diagnosis I can perform to figure out the reason for low gas mileage?
Thanks in advance.