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2004 Tribute. Fluctuating Gas Mileage

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Old 08-29-2017, 03:29 PM
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Join Date: Aug 2017
Location: Florida
Posts: 2
Default 2004 Tribute. Fluctuating Gas Mileage

I have a 2005 Mazda Tribute 3.0 with 162000 miles. It runs great. The problem I'm having is that I get different miles per gallon for every tank full. On one tank full I will get 19 MPG, then the next I will get 15 MPG, then 13 MPG, Then 10 MPG, then 15 MPG, Then 19 MPG, and so on. Originally I used to get 20 miles per gallon.

I have replaced the spark plugs, spark plug wires/coils, and every filter I can think of. Iím the type of driver that does not have a heavy foot.

What is weird about this issue is that the gas mileage fluctuates so much.

Can anyone tell me what could cause this?
 
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