hello, i would like to change my spark plugs, distributor cap and fuel filter because i'm experiencing mileage decrease. I'm gonna get them all from oem honda, also is there anything i should change? as for the fuel filter, do I need to replace the fuel hose too? thanks for help in advance.

 

how bout your O2 sensor?

 

How many miles on the car and was there any kind of maintenance done on schedule before?

You could very well have a slowly clogging fuel filter, and they're pretty inexpensive to change. Just some food for thought.