I'm not clear on what you have changed from your previous method of driving, so I can't speculate as to why your mpgs are flat.
From this,
Quote:
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If you look at my fuel log, you'll see that the power I use from the grid to charge the battery at night has gone way down, but my fuel economy has been flat.
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it sounds like you have been driving without the alt and just grid charging at home. If that's the case, then you wouldn't see any benefit to your mpg by charging it during DFCO. As you said, the power used to charge from the grid would be reduced, and that's it.