1993 Prelude fuel economy problems

I started having this problem quite a while ago. Now, since it got cold
outside it became even worse. I am getting at least 30% drop in my MPG.
On average I got about 24 MPG during normal highway and city driving.
Now i get about 17 MPG.
Recently I did full maintance on it. I have changed timing belt, spark
plugs, wires etc. I have not noticed any changes in the fuel economy
before and after my car got repaired.
My check engine light is off. In the morning car starts normally.

What should I check? Please advise.
Thanks

1993 Prelude 4WS
2.3L engine
175K miles
manual

 

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If you're in Alaska, it might be normal. Are you warming it up according
to the owner's manual?

'Curly'

 

I am in VA.
Every morning I warm up my car for about 2-3 min and then drive slowly
until engine reaches the normal temperature.

 

Consider everything listed at
http://home.earthlink.net/~honda.lioness/id11.html

Take seriously the counsel to use OEM for certain parts.

I'd probably replace the PCV valve first.

 

wrote in

Air filter?

Fuel mileage typically drops in winter temps. Northern gas stations change
their fuel mixtures in winter,too.

are you keeping your tires inflated properly?

you could also need a tranny fluid replacement.
Are you using the right engine oil grade? like a 5W30 if that's what's
called for for your model.

maybe a lazy O2 sensor? they can get "lazy" and not trigger a "check
engine" light.
They supposedly are only good for around 60-100K miles.
OEM sensors are best.

 

Thanks for the tips guys!