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Okay, we all like to hype our MPG at likely higher speeds than actual but we are talking about constant speed on flat ground (no hypermiling) per the INL tests. The C-Max can not get 43 to 48 mpg (actual fuel burned over miles driven) at a constant speed of 72.5 mph (70-75 averaged). On flat ground the C-Max will run in negative split mode virtually continuously at higher speeds which means ICE is on all the time. Torque requirement don't change and HVB SOC is in the high 50% range continually. When the 2013 C-Max first came out Cleanmpg tested it. I've attached a graph of their data. I have tested my C-Max FE many times over measured distances in both directions at constant speeds and generally get slightly higher numbers than the chart (but I run higher PSI. Ford did add a few aero enhancements in later modes that would affect the numbers somewhat and increasing PSI in tires might add 1 mpg max. The INL FE data used RLHP coefficients that under stated the final 2014 RLHP by over 8% for speeds above 15 mph. The effect on FE of the under stated numbers is seen in the EPA FE data. Ford lowered the EPA (city, hwy, combined) FE numbers from 47/47/47 initially to 45/40/43 in 2013 and then to 42/37/40 in 2014. So, the INL numbers are likely at least 2 mpg to high. I have also attached the RLHP chart for the C-Max Hybrid for comparison on how the RLHP numbers changed with Ford's revisions.