My '87 has been averaging roughly 11mpg since I bought it 5 months ago. This seems pretty low, even though it's gutless and heavy. It runs perfectly fine, but the fuel economy is killing me. It's the 3.0 V6, auto, and has about 200,000 miles on it. When I bought it, I replaced the plugs, wires, cap and rotor, fuel filter, and air filter.
Any ideas on what might be wrong with it, or what I could do do improve this?
I've already ran a tank of Lucas Fuel Additive, and that didn't help the slightest bit...