My 2013, Nov 2012 production Fusion Hybrid has averaged about 43 MPG from the start. It seemed to improve, marginally, after about 5K but could be better technique. My wife, always a conservative driver, seems to do nearly as well as I do without really trying or knowing technical strategies. We were happy with the milage, part year in flat Florida and part in W. NC mountains. Had the reprogram done in Winston Salem T Parkway Ford and the first 100 miles on the car, half highway and half mountain roads with both descents and climbs IS YIELDING OVER FIFTY MPG. Admittedly, I was careful and worrying IF I should have left well enough alone, already feeling lucky with an early car (gingerale, LOL) that we bought on impulse because my wife loved the color and hated the Edge I had planned on. I already loved this car and if this milage or even close to it holds up, I am a very satisfied owner. This replaced a 2010 Fusion SEL with a six that got 28 Mpg highway and just over 20 in town. THAT replaced V8 4 runner that got 15 mpg on premium.
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After the PCM software update/recalibration - observations by Hybridbear