My 87 Eldo (4.1, 63,000 miles) has gotten, at best, 22 MPG on the highway. Usually it is less than that. And I get 15-16MPG around town. I am light footed too.
I see many others posting 26-28 MPG highway, and 19-20 MPG city.
I have tried to check/replace everything I have heard about on this forum, yet my mileage has not improved, other than when I finally put good plug wires on (upped city from 13 to 16 MPG city).
Only thing I haven't done is replace the catalytic converter. How do I determine if it is restricting/clogged?
Any other suggestions?