I was pulling a combined 42MPG out of my 1994 Civic DX (Stock D15B7) until I developed a headgasket leak two years ago, but I'm still pulling a 6-year-combined 38.77MPG. I routinely get 42MPG tanks during the summer months, but then dip down into the high 36MPG range during the winter months. Here's my lifetime fuel-economy data...

1994 Honda Civic DX Hatchback Gas Mileage (5th Gen Civic Hatch) - EcoModder.com