FORD 2013 C-MAX Hybrid v.2 - Manual (Page 182)

Question Answer
Why does my engine never shut
down above 60 mph (96 km/h)? The engine is required to turn on
above this speed to protect the
transmission hardware. (For
C-MAX Energi vehicles, you can
travel up to 85 mph [137 km/h] in
EV mode.)
Why does my engine stay on when
it’s extremely cold outside? In order to ensure that the climate
control system can begin heating
the cabin or defrosting the
windshield as soon as a driver
requests it, the engine coolant
temperature has to be kept
sufficiently hot. Keeping the
engine on is required to maintain
the correct minimum temperature.
(For C-MAX Energi vehicles, this
is not required to maintain cabin
conditions.)
Why does my engine rev up so
high sometimes when I accelerate? 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 characteristics
of the Atkinson engine cycle and
the eCVT transmission technology
that help maximize your hybrid’s
fuel economy.
Unique Driving Characteristics 181
2013 C-Max Full Hybrid (34h)
Owners Guide gf, 2nd Printing
USA (fus)