valve tick and gas mileage

[Sijray21]

so as some of you may already know, i f'ed up my integra's valve clearances by trying to do it myself. i've had some nasty valve ticking noise for a few months now and i just monitored my gas mileage for the first time. its down. way down. i'm getting ~23mpg on a B18B. i know valve clearance issues can affect gas mileage, but my question is, can the exhaust valve clearance affect it, or would it be strictly an intake valve clearance issue?

i have a good feeling it would as well. Not releasing the waste from in sufficient clearances? not sure, just putting that out there.