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Old 07-19-2011, 06:20 PM   #31
Old TU
Focus Enthusiast
Join Date: Jun 2011
Fan#: 87303
Location: Garden Grove, CA
What I Drive: 2012 Tuxedo Black SEL 5 Door

Posts: 66
FF Reputation: 1 Old TU Good Standing Member
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How many miles do you have on your car? You state 90% of your driving is highway. Your car probably hasn't worn in yet. Letting the engine stay at one RPM doesn't allow the engine to let the rings seat properly.

I believe it is the EPA that calculates the MPG's.

I suggest you read pages 358 & 359 0f your owners manual.
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