issue is my 2007 3.3 santa fae has 96K miles. I did 100K tune up and valve cover gasket repace at 91K. After the work was done I went from 20.1 mpg to 16.5 mpg. Why the decrease in mpg?

santafaefrank
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Asked by santafaefrank Mar 16, 2014 at 03:08 PM about the Hyundai Santa Fe

Question type: Maintenance & Repair

Since MPG dropped after the work at 91K I began alternating between seafoam and berrymans injector cleaner every 3000 miles but no increase in MPG back to 20.1  The truck run good, has power, accelerates well but the mpg is bothering me.  New tires (firestone destinations at 35lb cold)  any ideas. truck now has 96500 miles.

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