Howdy everyone.
First, apologies for any rules I might break. I am new here, and about at my wits end with my 9-5 Aero, so I wanted to rattle this off on a break from work. I did try a few searches for similar issues, for what it is worth. Nothing seemed to exactly match my problem.
A few months ago I purchased a 9-5 Aero that I absolutely love(d). Hugely practical wagon, great power, beautiful car, etc etc. Feels like you know something other drivers don't.
However, the car doesn't seem to love me back. It has needed a heap of work, but more worrying to me is the fuel economy. I'm in Seattle, so obviously it isn't going to push upper 20's crawling around the city, but I *regularly* see 14-16 MPG for trips around town. Even coming back from the mountains on the highway (all downhill) I barely pushed 24.5. I don't use Sport Mode at all anymore, and the car has:
1. a freshly cleaned MAF sensor.
2. the tranny fluid is apparently fine.
3. thermostat and coolant sensor are new.
4. new alternator and brand new top of the line battery.
5. New tires that are properly inflated.
I am pretty shocked at these SUV-like numbers, and don't really see it as financially feasible to keep putting premium into the vehicle if this can't be improved. Honestly I am getting passed by garbage trucks and still seeing these numbers, which is astonishing. I don't even wind it out anymore as it almost feels like you can see the gas gauge dropping in real time.
Any pointers? Could the SID possibly be totally off?
Edit:
I should add the car is right at 100,000 miles, and is an auto. I've also tried to use an OBDII scanner to watch the fuel trim. It seems ok, though I don't really know what I am looking for.
I had the thermo and sensor replaced today, and am hoping this will fix the issue.