Why is my 1994 Honda accord getting bad mileage?

I had a bad ecu I changed it car runs good now but mileage is still bad my est is about 10mpg in city. Car drove about 130 miles on 3/4 tank all city driving. The only code I have is for the egr valve. Tailpipe smells bad too so it's running rich but why are their no codes?

Change your air filter.

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