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A CMax expert on the Fusion forum indicated the temperature penalty below 65 degrees F is 2 MPG per 10 degrees. The speed penalty on MPG is 0.6 MPG per mile over 65 MPH. Expected behavior of the FFH and Cmax are similar.
So at normal temps just using the MPH penalty, the FFH gets 35 MPG at 75 MPH. That is based upon a starting point of the Consumer Reports tested mileage of 41 MPG on the highway. Exactly the reason I avoided this car since I do some long highway trips.
In contrast, my worst mileage in my 2012 TCH on the highway has been 35 MPG while cruising at 78 MPH and 30 degrees F. It appears the temperature and mileage penalties are far less with the TCH than the FFH, possibly half on both.
If this is true I will enjoy cruising at 75 MPH while still acheiving 40 MPG all Summer, 5 MPG better than my FFH-owning friends. While the 5 MPG may not sound like a lot, that's 12 below EPA for the FFH while 2 above EPA for the TCH. The takeaway is just that it supports my decision that the TCH was the better choice, based primarily on weak real-world highway MPG performance by the FFH.
Last edited by upatches; 03-27-2013 at 10:36 AM.