If you drive a constant 55 MPH on a calm wind day, you will get the raw EPA Highway numbers.
It is a complete waste of time to argue about individual anecdotal MPG results. Conditions/routes/driver habits are completely inconsistent, and thus results are too variable to be of any real use.
Which is why I suggested using Consumer Reports as a Sanity check. They have the largest consistent database of Fuel economy testing outside of the EPA.
But you shouldn't need to drive 55 MPH to meet EPA Highway numbers.
Consumer Reports tests at 65 MPH averaged in two directions, and nearly every car beats the EPA highway number.
Here are some Hybrids as an example (EPA ratings vs testing at Consumer Reports 65 MPH):
Toyota Prius: EPA 50 MPG, CR 55 MPG, Difference: +5 MPG
Honda Civic Hybrid: EPA 44 MPG, CR 50 MPG, Difference: +6 MPG
GM Tahoe Hybrid: EPA 20 MPG, CR 25 MPG, Difference: +5 MPG
Note that every hybrid here easily beats the EPA rating. Now the Ford Hybrids:
Ford C-Max Hybrid: EPA 47 MPG, CR 38 MPG, Difference: -9 MPG
Ford Fusion Hybrid: EPA 47 MPG, CR 41 MPG, Difference: -6 MPG
Not only does it not beat EPA number like just about every other car in existence, while competing hybrids are averaging 5 MPG over EPA, the Fords are averaging 7 MPG UNDER.
In the comparison of results, Ford stands out massively as an outlier here. More than any car ever before, more than Hyundai BEFORE they were corrected for cheating.
Ford is either cheating, or has managed to game the test to the extent that I would still consider it cheating.