[Smith1000]

I replaced my O2 sensor last fall and did some other tune up stuff, plug wires, plugs,etc., but it didn't seem to help. Since then, the MPG has declined, but more so recently. I filled up with gas today, so I should see if my transmission fluid being filled up does any good. I believe I only overfilled it about a quart which probably won't hurt anything. It runs great, no complaints there. It has about 154,000 on it now.