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I disagree; a reduction of 15% is pretty substantial. Also, I'd be more concerned about the mpg drop being a symptom a larger problem as the OP and some others have suggested.
It sounds large from a mpg point of view, but from a gallonage POV, the delta after 100 miles of driving would be ~0.38 gallons.

If you had a car that got 20 mpg and it dropped to 18.5 mpg, would you notice or make a big deal out if it? After 100 miles, the delta between those is ~0.41 gallons.

Agree that it could be the symptom of a larger issue.
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