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What can I do to get better mpg for my vehicle i am only getting 10mpg in city on 2003 Mazda Tribute

I changed all four oxygen sensor.
I also only drive in O/D should i not drive that way in the city.

Asked by for the 2003 Mazda Tribute
Check engine light on? OD will take care of itself, no need to change.
What engine 4cyl or V/6?
V6 3.0l 6cyl
Light on?
no
Check mpg again. Has to be more than 10.
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2 more answers , 1 more comment
what are your emission readings.h/c and co
I am not a mechanic so I am not sure what you mean by h/c and co
Was check engine light on BEFORE replacing all 4 O2 sensors? ...So if you fill-up the tank and drive 100 miles and hit the next gas station you'll be able to put in 10 gallons of gas? Your one reply states that you are not a mechanic so that makes me curious as to who and why the oxygen sensors were replaced, because if all 4 were failed at the same time it would be odd and most likely due to some other cause/failure.