my 94 accord ex also had bad gas mileage problem. Turns out that my ignition timing was off and my catalytic converter was shot. I was doing 15 mpg in the city and after the timing adjustment and replacement of the catalytic converter, my mileage went up to 20 mpg. Hope that helps.

 

Are you sure you are getting Torque Converter lockup of the trans? The shift pressure cable might need adjustment.
read the other post ["honda shifting"] about the trans shift, the info applies to your car as well.
ELD was a Civic feature

 

the transmisson has nothing to do with gas mileage and neither does the alternator the alternator only job is to keep the battery charged while the car is running an to keep the battery from going dead
check your timing and your spark plugs if its what i think it is your misfiring in every cylinder, your gonna need a new CAT an on my recomendation flush your coolant, oil, an transmission oil,an add new coolant oil, and atf oil, and 4 1/2 quarts of 5w30. i got a 92 accord coupe an when i bought it my gas mileage was **** now im close to 30mpg highway, an 26 mpg n the street