The HX doesn't have a specific meaning. In 1997 there were five different civics made each had a different prefix with no specific meaning.
Honda HX has a CVT (continuously variable transmission).
You can change a Honda Civic HX transmission to a manual transmission. It is not an easy job to do.
Yes.
starting problems
In good conditions 600
Close to the Intake Manifold
In the gas tank.
4 quarts
Because it is a Honda with a tiny motor.
under the rear seat
that is your air bag light
3 qts.