Buick 2007 Terraza Owner's Manual page 226

Average Speed
Press the information button until AVERAGE
SPEED displays. This mode shows the average
speed of the vehicle in miles per hour (mph)
or kilometers per hour (km/h). This average is
calculated based on the various vehicle speed
recorded since the last reset of this value. To reset
the value, press the information button to display
AVERAGE SPEED, then press and hold the
set/reset button. The display will return to zero.
Fuel Range
Press the information button until FUEL RANGE
displays. This mode shows the approximate
number of remaining miles or kilometers the
vehicle can be driven without refueling.
Fuel range is based on several factors, including
distance travelled, fuel used, fuel capacity,
etc. This estimate will change if driving conditions
change. For example, if driving in traffic and
making frequent stops, this mode may read
one number, but if the vehicle is driven on a
freeway, the number may change even though
the same amount of fuel is in the fuel tank.
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This is because different driving conditions
produce different fuel economies. Generally,
freeway driving produces better fuel economy
than city driving. Fuel range cannot be reset.
If your vehicle is low on fuel, FUEL RANGE LOW
will display followed by the LOW FUEL message.
See "LOW FUEL" under DIC Warnings and
Messages on page 230 for more information.
Average Fuel Economy
Press the information button until AVG ECONOMY
displays. This mode shows the approximate
average miles per gallon (mpg) or liters per
100 kilometers (L/100 km). This number is
calculated based on the number of mpg (L/100 km)
recorded since the last time this menu item was
reset. To reset AVG ECONOMY, press and
hold the set/reset button. The display will return
to zero.
Battery
Press the information button until BATTERY
displays. This mode shows the current battery
voltage.