OK.. So I just got rid of my 2007 mustang v6 for 2010 fusion sel awd.
So far I'm finding it to be relativity close, though it is middle of summer and I only have 3 records so far.. But I'm getting opposite results as most here..
My mustang I had years of data logged in app, ranged from 8.91-10.69 L/100km or 26.4-31.7 mpg with average of 9.68l/100 or 29.17 mpg
With my 2010 fusion so far I got 9.64, 9.04, 9.43 (average of 9.37) L/100km or 29.29, 31.21, 29.94 (avg of 30.15) mpg