I'm wondering why Fuelly.com shows the C-Max averaging about 41 MPG while Fusion Hybrids get 40 MPG average.
(That is over many, many owners and thousands of miles of statistical validity. Measurement errors and driving styles/cycles average out over that many.)
The EPA combined MPG estimates for the C-max is 40 MPG, and the Fusion gets 42 MPG, about the opposite of what is happening out there.
I just include 2015,16, & 17 model years of each since they likely have the same powertrain control optimization algorithms.
The Fusion should be doing better since it has an aerodynamic advantage which should translate into about a 5% MPG advantage, or about 2 MPG.
The Fusion Hybrid is slipperier with a CD=.27 vs. our C-Max's 0.30, which is due to C-Max's boxier shape.
For total drag, which is CDxFrontalAreaxDynamicPressure, the Area is important, and the C-Max has 8% more frontal area.
Why isn't the Fusion getting better Fuelly.com averages? EPA says it should. Aerodynamics say it should.
Anybody know what's going on here?
As many here know, our C-Max has the same powertrain as the Fusion Hybrid.
Also, the weight of the two are about the same (within 25 lbs of each other!).
Wheels and tires are the same size, unless a Fusion owner has the optional slightly wider tires, still not much difference there though. I assume most Fusion Hybrid owners have the same size tires as C-Max drivers have, 225/50-17.
5 years ago, the C-Max had some controversy and had to downgrade its EPA MPG estimates because Ford had used Fusion's CD to compute road loads on the MPG test procedure, which is obviously wrong since the CD's are different by 10% and frontal area by another 8%.
Even more strange is that I consistently get 44 MPG, checked by fuel tank fillups and also the dashboard display (both agree). I guess I do more stop and go driving than average C-Max drivers, which would raise mine over the Fuelly.com average of 41 MPG, yet I think my driving profile actually has a lot of highway-style stuff in there, and I am not easy on the gas pedal either.