You may want to check any hose deal with air, or vaccum(air leaks).
No, 92 and sometimes 93, but not 88-91
Passenger side behind tire.
try a new gas filter try a new fuel filter
Check your transmission mounts on cross member
I have a 2005 civic lx and I get about 40 or more sometimes on the highway. And something like 36 in the city.
You want the car to start in gear? Are you nuts?
Under shifter boot or housing. It detects position of shifter so you can only engage starter in neutral.
== == Clutch plate may be worn and or needs to be adjusted properly. Could also be bent shift lever actuating rod that moves incorrectly when you move the shift lever.
owners manual.....sometimes under the hood.
generally the EX, sometimes other models, depending on generation
could be either transmission shift linkage not engaging reverse ( stops at neutral ) worn joint connectors sometimes cause this. or reverse clutches or gears bad inside transmission.
From your local registry office, sometimes located at a civic centre. or council offices