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Originally Posted by jogle
We've probably driven it 80% of the time on the highway and figure we've got about 19 MPG. Like "Implicated", we do not have a lead foot and have tried to break the vehicle in with some ease as recommended in the owner's manual. Wonder if "Implicated" has had any luck in resolving the problem. Can a bad ECM be the culprit as mentioned by another user? We're going to fill up a couple more times to give it the benifit of doubt but if it doesn't improve I don't know what to do. Any advise out there?
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I'm starting a hypothesis here... I'm starting to notice a lot of folks with bad fuel mileage are breaking in their vehicles with "ease".
Just a quick fact, part of breaking in an engine is having the piston rings seat well. If the rings don't seat, you get blow-by, which is basically gasoline blowing by the ring getting into your oil, or vice versa. Either one of those will cause a loss of compression, therefore causing less efficient burn in the cylinder, therefore causing less power and less fuel economy.
Being easy on an engine during break-in will only prolong the break-in process, and may permanently cause your rings to not seat well at all.
Here's a bit of a reference for you to read;
http://www.mototuneusa.com/break_in_secrets.htm
So, there's my idea - believe it if you wish, however I must say by NOT being easy on my new cars, I've always had top notch power when compared to similar vehicles and excellent fuel mileage.