Rep Power: 0

hey sup guys, im new to this forum.. any ways back to the problem .. i just got a oil change a few weeks ago an i notice for some reason im losing more gas per milage... any ideas/suggestions.. i was planning to go to jeffylube to see wasup but i dont wanna get ripoff so HELP ME OUT GUYS .. thanxx oh yeah my car is a civic ex 04

 
Rep Power: 388

more info.

How much of a difference in gas mileage?
Are any fluids leaking from the bottom of your car?
Have you been using the defroster (with AC?)
Did they do anything becides change your oil?
Did they do a filter check?

 
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full tank of gas . now its on half and its on 90 miles on the odometer

25miles per gallon (city)
32mile per gallon (highway)
this is what it feels like
an they only changed the oil an the oil filter
no filter change yet
not using any ac
an no fluid leaking

 
Rep Power: 388

like we talked about on AIM...

Wait till the tank is refilled to calculate MPG because the gas gauge is known to be inaccurate on our cars.

 
Rep Power: 255

yeah, i'm getting the same issue, i'm thinking bad o2 sensor cuz i just changed my spark plugs, timing and i also got a new clutch set(cuz my old clutch was out) yet i'm getting about 260 @ 10 gallons.. actually a little over 10 gallons. O2? yes? or something else?

 
Rep Power: 388

Also mixture of gas in the wintertime is formulated differently for the cold weather and it does give 3mpg or so less as opposed to the summer time forumla.

 
Rep Power: 811

i only get 32mpg highway in winter and over 40 in summer

 
Rep Power: 388

I have to say, a few weeks ago when I did a test, I got 39.7mpg all highway with no AC on winter formula gas. I had buddy in the car and full trunk too. I'm manual though.

 
Rep Power: 0

i found out what the problem was. it was the OXYGEN SENSOR FAILURE. with a whooping 100 $ to get it check. now i need 300 to fix it.