I have a 1996 Voyager SE 3.3 with 208,000+ miles. My mileage wasn't what I wanted, 20-21 hiway, and my check engine light was on, for over a year. In the last two months I've replaced the EGR (cause of the check engine light), the spark plugs, plug wires and both Oxy sensors. My milage continues to drop. Less than 19 on the last tank, and this tank looks even worse. The engine starts in less than 3 seconds, it has power, runs smooth and idles smooth.
Whats going on? I was better off before I started.
I would try this I would buy some stuff called STP FUEL BUSTER. And fill your gas tank and dump this in and it will do better on the gas milage as I was getting 24 with mine on the hiway and am know getting 35