Cadillac 2010 DTS Owner's Manual page 226

See Headlamp High/Low-Beam Changer on page 4 6
for more information.
4-60
This light comes on when
the high-beam headlamps
are in use.
The fuel gauge shows
approximately how much
fuel is in the tank. It works
only when the engine
is on.
An arrow on the fuel gauge indicates the side of the
vehicle the fuel door is on.
If the fuel supply gets low, the FUEL LEVEL LOW
message appears in the Driver Information Center
and a single chime sounds. See DIC Warnings and
Messages on page 4 66 for more information.
Here are a few situations that may occur with the fuel
gauge. All of these situations are normal and do not
indicate that anything is wrong with the fuel gauge:
At the gas station the gas pump shuts off before
the gauge reads full.
The gauge may change when the vehicle is
turning, stops quickly or accelerates quickly.
It takes a little more or less fuel to fill the tank than
the gauge indicated. For example, the gauge may
have indicated that the tank was half full, but it
actually took a little more or less than half the
tank's capacity to fill the tank.