Elwood.....The tricky thing with these engine is they have lots of vacuum lines...one little vacuum leak makes it run like shit (it may sound like it runs good but the gas mileage is terrible) And that mileage is on the highway doing about 72mph and being easy on the gas over a 30 mile stretch. On normal driving I get about 22mpg on average 398 miles on 17.8 gallons of gas. Double check your airfilter and all other emissions equipment.
Here is the coil I put in my car