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I used a half can of Seafoam in a full tank of gas for my 2002 Forester. Prior to using the Seafoam, I was getting an average 22.7 mpg. Post treatment, for the past 5, or so, tanks, I've now been averaging about 19.5.
I did get an oil change after using up the tank of gas that received the Seafoam.
What happened, and how might I get my fuel economy back up?
(The last time the spark plugs and wires were replaced was Spring of this year. I haven't noticed anything strange in engine performance or sound, and there have been no CELs. Also, I have not noticed any new marks / stains on the ground from leaking fluids.)
I did get an oil change after using up the tank of gas that received the Seafoam.
What happened, and how might I get my fuel economy back up?
(The last time the spark plugs and wires were replaced was Spring of this year. I haven't noticed anything strange in engine performance or sound, and there have been no CELs. Also, I have not noticed any new marks / stains on the ground from leaking fluids.)