Honestly all these EPA numbers are hard to manage. From what I can tell, the mileage will vary wildly depending on how you drive it.
I wrote about this in another post, but if you plan to drive long distances on the highway, then you are probably better off not lugging the giant battery around and just get the hybrid. We talked about this in the Decisions, decisions thread http://www.fordfusio...cisions/?p=1053
I think the that the EPA is 108 for city driving all electric, but my lifetime is currently sitting at 138.2 (471 ev miles out of 565)... so what exactly does that mean? I had to work really hard to get that number, and I know that you could get really poor mileage if you don't mind the braking, accelerate hard, crank the AC, and travel at high rates of speed. But most of these behaviors will mess up the EPA rating of a Honda Civic as well.
The window sticker says 100 and 43 though, and driven reasonably that is probably achievable.
I made a simple spreadsheet calc that has the following cells
I set the electric to 21 miles and have a cell that defines that at 100 mpge
then I enter the number of gas miles, calculate that at 43 miles.
then the total miles at the top is the combined mileage, with the avg being calculated [ =((B4/B3)*C4)+(B5/B3)*C5 ]
C4=electric epa estimate
C5=gas epa estimate
I did this just to guess at what I would get at various miles driven to see how close I am to the epa avg... especially with all the whining going on. So far I am exceeding the projections... but in most cases I am driving mostly EV miles. In May I think I will take my first road trip. That will be interesting. I think the trip is right at about 500 miles, so I should be able to make that on a single tank! (Unless driving 75mph gives me horrible fuel econ)
Some interesting data points.
By the calculator, if you drive 100 miles you should achieve 54.97 mpge.
Your break even on Hybrid and PHEV is 300 miles at 46.99 mpge