I've done a lot of searching but really haven't found much information. It appears most solutions to the fuel economy question has been that it's just normal after age.
So, I have a 1998 Forester S, EJ25D with the auto transmission with the clock at 234k miles. The car gets about 20mpg on the highway, around 14-16mpg around town. It's only about 1-3mph better than my old 6.9L Chrysler. The previous owner is a family friend so when he tells me it averaged 24-26mpg before it broke I believe him. Bought the car for cheap because headgaskets were blown (combustion chamber to coolant passage). With help from friends I replaced the headgaskets and all the associated gaskets with it. I suspect something may have been missed, or possibly done wrong that could have comprimise the fuel economy. So anyway, here's what I have replaced, checked etc:
Torque bind - was repaired
Spark plugs, wires, pcv valve, timing belt, timing belt pullys (tension and idlers), tires, front O2 sensor, fuel filter and air filter replaced.
I've cleaned the MAF with MAF cleaner and ran seafoam in the gas tank.
Replaced cracked and broken vacuum/crank ventalator hoses and checked for vacuum leaks.
No engine check light or codes. Does anyone know of anything else that I can check before spending hundreds on more parts? or to find out if I need to buy more parts? I'm kind of suprised that even though it's a smaller lighter car than the 2001 Outback I used to have, it does worse on gas, even with the same sized engine. I'm wondering if maybe the cat is gummed up from when the car had blown head gaskets.
Any ideas would be great to hear, thanks!
Edited by Mr. Carb, 14 July 2014 - 11:17 PM.