Honda 2008 Civic GX Owner's Manual page 6

Instrument Panel Indicators
If you smell natural gas or hear a
hissing sound, except when refueling,
the fuel system may have a leak.
Follow the instructions under
on page
Fuel System Has a Leak
28 of this supplement.
4
Instruments and Controls
Low Fuel Indicator
LOW FUEL INDICATOR
If the
This indicator comes on for a few
seconds when you turn the ignition
switch to the ON (II) position. It also
comes on as a reminder that you
must refuel soon. The approximate
driving distance remaining when this
indicator comes on is:
City driving 20-25 miles
Highway driving
As the temperature of the outside air
cools, the temperature inside the
tank begins to drop, and the
pressure inside the tank drops too.
This means that when the outside air
gets very cold [below 25°F ( 4°C)],
the pressure of the natural gas inside
the tank goes down, and the fuel
gauge may indicate that you have
less fuel than what actually remains
in the tank. Keep this in mind if the
low fuel indicator comes on while
you are driving in cold weather.
If this indicator starts blinking and
the fuel level reading goes down to
empty when the engine is running, it
indicates a problem in the fuel
system. Have the vehicle checked by
an authorized Honda Civic GX dealer
as soon as possible.
25-30 miles