I put new spark plugs in and new air filter unclogged my cadalac converter yet im still getting 200 miles on a full tank of gas what could be the problem?

Has your Honda had a tune-up lately? How many miles on it? Sounds like spark-plugs and spark plug wires...also Air Filter, and please add 1-2 bottles od Lucas Oil fuel injector cleaner to the gas tank...could be "old" gas also...and lastly a new or clean air filter...Hope this helps, these are not expensive parts.

Your fuel sending unit in tank is bad,may be incorparated with fuel pump or by itself.Car isn't going to drink gas that fast unless leaking.If tank reads a half,fill up to see if it's really half empty,and if it is half full,then your driving a gas hog.

yes try getting the fuel pump pressure tested by a mechanic. the other thing it can be is the injectors are plugged try running some lucas fuel system cleaner.

I would try changing the oxygen sensors, they are required to be changed each time you do a tune up also if you purchase a K&N air cleaner you will get much better gas miliage.

I'd check for proper fuel pressure, my info says 35--65 psi. If your somewhere in the middle, it should be fine. Once you build pressure, turn off the key, see if the pressure holds for a bit. If it drops like a rock, you have a fuel pressure leak. Possibly a fuel injector?
Can you check fuel trims to see if system is adding or subtracting fuel?

maybe it's the timing chain,turn the crank with a socket untill #1 cylinder is at top dead center,pull off the distributer cap and check which plug wire is the rotor is at.if it's not #1 cylinder's plug wire,the timing chain has jumped.

if you have'nt replaced those spark plugs and wires lately, you need to.and also, lucas fuel treatment, in my personal opinion,is the very best for unclogging fuel lined and injectors.it being below a 1999 model and your check engine light is on, you can have it coderead for free if you're near anautozone or advance automotive parts store. they will code read it and tell you why that check engine lights coming on.hope this helps and thank you for choosing fixya.com

Try a major tune up (spark plugs are only one part of it) fuel/air filter, PCV valve, cap, rotor, spark plug wires and adjust timing..

Top speed on a wrangler is typically about 15 miles faster than what you are getting. Check the air pressure, air filter, spark plugs and fuel filter. If all of these are good your carbeurator may be partially blocked. Begin with a fuel additive that will clean your carbeurator. I have had success with a product called seafoam which you add to your gas tank at a rate of one ounce per gallon of fuel. Use it for a couple of fuel tanks full of gas.

when was the last time you put in fuel injector cleaner? I put in Lucas Oil Injector cleaner every other or every oil change.

There are alot of factors affecting your gas mileage. Tire wear, tire pressure, wheel alignment, air filter, fuel filter, spark plugs, oxygen sensors, just to name a few. So to say what you need is just shooting in the dark without more information. I would probably start with your oxygen sensors, and then perform a tuneup. If your vehicle pulls to one side or the other when driving on the highway you need to stop into the shop for a wheel alignment.