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I have a 2008 passion with 69K on it. It has historically ALWAYS gotten over 40 MPG with AC on, without AC at least 43, up to 47. I drive conservatively and about 75 -80% of it on freeways in the Dallas, TX area. The car runs well and has plenty of get up and go. Last 6 weeks MPG with AC on the mileage has dropped to 32 MPG range, give or take 2 miles. It has not been very hot for this time of the summer. All filters were changed at 50K and all maintenance is done as per owner's manual or sooner.

Any ideas what is wrong with my old friend?
 

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Possible due for a tune up ? MPG =fuel +air +spark,+combustion +aerodynamic drag. One or more have changed .
 
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