How much money do you have? Cuz ITBs and FI is a costly setup for a Daily Ddriver...

You really need to reconsider some things...Because this is going to be expensive... not just in tuning but parts alone...

Other than that, good tuning will get you great gas milage WCS had like 30-35mpg on his 300+ B18C Turbo - Powered 4 Door Civic

Do more research, pick a route N/A or Turbo...

If you have all this money to spend on your civic I suggest you look into a K24/K20 R swap, 12s is a guarantee "stock" with that setup...