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The car does have 230k on it, and burns oil (as Saturns do), so the first thing I checked was the cat, and the O2 sensor.
I have lost 35% of my fuel efficiency!
I normally check the tire pressures, it does not have mechanical timing, the plugs and wires are less than a year old, and like I said I pulled the plugs and inspected them. The alignment is not perfect, but the problem is slowly getting worse I don't think the alignment could slowly get worse. Could it be? I have also checked my hub and tire temps after a few long and short trips, I had a brake hose lock up a caliper in the past. I do not think it is a drag problem, as I take the same route everyday and my EOC distance has not changed. It is also not seasonal/climate thing, as I have had the car for 3 years taking the same route.
Fuel filter is the one thing I have not done.
Could a bad fuel filter cut my mileage almost in half? I just about got one before making my post, but did not think it could make that big of a difference. I am not one to throw money at a problem and hope it goes away. Maybe the car is just on its last leg...
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