Ford FUSION HYBRID 2015 Owner's Manual page 157

Unique Driving Characteristics
Question
Why does my engine rev up so high some-
times when I accelerate?
What is the fan noise I hear from the rear
of my hybrid?
What is the engine oil change service
interval?
Can I put E15 or E85 in my vehicle, and how
will it affect my fuel economy?
Fusion/Mondeo (CC7), enUSA
Your vehicle's engine and transmission are
designed to deliver the power you need at
the most efficient engine speed. This may
be higher than expected during heavy
accelerations, and may fluctuate during
steady state driving. These are character-
istics of the Atkinson engine cycle and the
transmission technology that help
maximize your hybrid's fuel economy.
The fan noise comes from a fan located
outside the high voltage battery. This fan
turns on when the battery requires cooling
air. The fan speed, and associated noise
level, will change according to the amount
of cooling required to maintain good
performance. Maintaining the battery
temperature at optimal conditions also
prolongs the useful life of the battery and
helps to achieve better fuel economy. Do
not place objects on the package tray which
could block air flow through the hybrid
vehicle battery cooling vents.
Change the engine oil every 10000 miles
(16000 km) or once per year under normal
operating conditions.
Your hybrid vehicle can use E15 (15%
ethanol, 85% gasoline) fuel, but you may
notice slightly reduced fuel economy
because ethanol contains less energy per
gallon than gasoline. Your hybrid vehicle is
not designed to use E85 (85% ethanol).
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Answer