Chevrolet 2011 Volt Owner's Manual page 137

This gauge is a guide to driving in
an efficient manner by keeping the
ball green and in the center of the
gauge. The leaves stop spinning
when the vehicle stops or when the
ball travels away from the center of
the gauge.
See
.
If the ball turns yellow
and travels above the center
of the gauge, acceleration is too
aggressive to optimize efficiency.
If the ball turns yellow
and travels below the center of the
gauge, braking is too aggressive to
optimize efficiency.
Total vehicle range is the remaining
distance the vehicle can be driven
combining the electric range and
fuel range.
See
.