I had a 1991 FC.. Its been a REALLy long time ago but I recall getting around low to mid 20MPG..

My FD stock back in the days with min. boost, I was getting 20-22MPG.. And on the long interstate drive up to 26MPG.

My 8, I been getting 17-19 in the city and 20-23 HWY.

I saw if you are worried about gas, get a civic.