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Q: Poor MPG on 2010 Ford Fusion Hybrid

I bought a 2010 Fusion Hybrid in Jan 2010. For ten months, I got in excess of 41 mpg city and highway driving. The long term was 41.5 mpg. Since December 2010, I have been averaging 36 mpg, with the long term dropping to 39.1 mpg. I have not changed fuel sources, driving commutes for habits. Also, when I depress the brake pedal, the regenerative braking display does not display until I have driven approx 10 miles. (I have not experienced the loss of brake feel as noted in recalls, and the Purvis Ford, Fred., Va says my vehicle was not affected by the recall).
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I would probably have the dealer look for a calibration issue. Other than that, there is probably no further suggestion for repairs. Keep in mind that winter months will steal away a bit of fuel economy as it will take far longer for the engine to warm up. And don't forget, with a hybrid, the engine is not always it may take even longer.
I had a used 2010 ford fusion hybrid I put a k/n air filter and I averaged 42 on the highway, not 36 as postedon the window sticker
We've had a 2010 Ford Fusion Hybrid since purchased new in April of 2009. Even during our relatively warm Southern California winters, our mileage has consistently gone down during the colder months. Just as some have reported, the car does not drop into hybrid mode for much longer periods after start up. We're also using the heat, defroster and heated seats regularly. Over the long term, our car has averaged 37.7 mpg. The average creeps up during the mild months, especially April through June, since we don't need the AC near the coast, and drops back down, especially Dec through February.
Interesting issue with your Ford Fusion hybrid. We also own a 2010 model, purchased it in the summer of 2009. This winter we have experienced exactly the same issue you are describing in your post...a noticeable and relatively substantial drop in mpg...from about 41.8 to 36 or so. Just took it in to the dealer for a 20K service, notified them of the drop in mpg, and they told us everything seemed to be working properly on the vehicle. They too suggesting winter driving conditions or gasoline type might be the problem...we're skeptical.
It is my belief it is temperature related. The hybrid battery does not like cold weather (below 32 degrees). A week after I submitted my question, the temperature went up 10 degrees for several days, and so did the mileage.
It is true that ANY battery is not great in cold weather. It's true anywhere you research that cold weather saps these large battery packs. Also true for the pure electric vehicles coming out (Electric Focus, Chevy Volt, Nissan Leaf...). So indeed - it's a good point.

Actually, getting a little more detailed, a gasoline engine does not like cold weather either, and takes more effort to warm and maintain running. Takes additional fuel then too.

Good topic of conversation!
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