So what folks, there is a way to change the fuel used to percentage? I don't recall that in the manual.
From my Manual, 2010 DTS, Pg. 4-63(scroll down to last item) -''showgirl'':
Trip/Fuel Display Menu Items
3 (Trip/Fuel): The following display menu items
can be displayed by pressing the trip/fuel button:
TRIP A or TRIP B
These displays show the current distance traveled since
the last reset for each trip odometer in either
kilometers (km) or miles (mi). Both odometers can be
used at the same time. Each trip odometer can be reset
to zero separately by pressing and holding the
set/reset button for a few seconds while the desired trip
odometer is displayed.
This display shows the approximate number of
remaining kilometers (km) or miles (mi) you can drive
without refilling the fuel tank. This estimate is based on
the current driving conditions and will change if the
driving conditions change. For example, if you are
driving in traffic and making frequent stops, the display
may read one number, but if you enter the freeway,
the number may change even though you still have the
same amount of fuel in the fuel tank. This is because
different driving conditions produce different fuel
economies. Generally, freeway driving produces better
fuel economy than city driving.
Once the range drops below an estimated 64 km
(40 miles) remaining, the display will show FUEL
If your vehicle is low on fuel, the FUEL LEVEL LOW
message will be displayed. See “FUEL LEVEL
LOW” under DIC Warnings and Messages on page 4-67
for more information.
AVERAGE ECONOMY (AFE)
This display shows the approximate average liters per
100 kilometers (L/100 km) or miles per gallon (mpg).
This number is calculated based on the number
of L/100 km (mpg) recorded since the last time this
display was reset. To reset this display, press the
set/reset button. The display will return to zero.
INST (Instantaneous) ECONOMY (IFE)
This display shows the current fuel economy in either
liters per 100 kilometers (L/100 km) or miles per
gallon (mpg). This number reflects only the fuel economy
that the vehicle has right now and will change frequently
as driving conditions change. Unlike average economy,
this display cannot be reset.
This display shows the number of liters (L) or
gallons (gal) of fuel used since the last reset of this
display. To reset this display, press the set/reset button.
The display will return to zero.