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I have a 2010 Prius III and I average 52 to 54 MPG in the summer, city driving (and using a/c when needed). In the winter, it is 42 to 45, depending on how cold it is. So when I see that you averaged 42 to 44, it makes me wonder if your driving habits are lowering the expected MPG in the Prius and now in your C Max. And a comment about hills. I took the Prius into the mountains, and averaged the same as I did on regular highway. That is because it averages out. By that, I mean you lose going up the hill, but gain coming down on the other side. So it equals itself out.Report it
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