6
Rolling MPG, Recent MPG, Instantaneous MPG, and
Power Factor
Instantaneous MPG indicates the fuel economy calculated on a
moment-by-moment basis. It generally fluctuates too rapidly to be
useful for guiding your driving, so the VMS calculates a Rolling MPG.
Rolling MPG considers fuel consumption over roughly a one
minute time interval, while ignoring very low speed driving and idling.
Recent MPG is over a 20 minute period. It provides a very good indi-
cation of your current fuel economy, and is a useful tool for adjusting
your driving to get the best fuel economy.
Power Factor indicates the efficiency with which the engine
is converting fuel to power. Although it is a good indicator of pure
engine efficiency, it is generally not correlated to overall vehicle ef-
ficiency, since it does not consider air resistance, rolling resistance,
and parasitic loads.
Trip Screens
Press
T
rip
to activate the Trip Screen. The top portion of the
screen show the Distance travelled during this “trip”, the number of
hours and minutes the engine was running, the average speed, and
the gallons of fuel used. The hours and MPH values are based on en-
gine run time, not the total elapsed time. Sitting and idling the engine
will affect these values, but sitting with the engine off will not. Trip
Miles Per Gallon will be displayed on this screen.
Pressing
T
rip
repeatedly will move the red selection box around
the screen to enable clearing of the Trip 1 and Trip 2 sections by
pressing the
C
lear
button. Lifetime totals are also shown on the left
side of the screen.
Trip Planning
With the selection box on the top portion of the screen Use the
knob to set the expected number of miles you plan to travel today.
Turn the knob for 1 mile increments or press the knob for 100 mile
increments. The VMS will slowly count down as you drive, and cal-
culate the gallons of fuel required to reach your destination, and the
estimated time of arrival. These will constantly be recalculated as you
drive, and are based on your average fuel economy and speed for this
particular trip.
Press
C
lear
to start a new “trip”. All values on the screen will
reset to zero. The information cleared from Trip 1 will be stored and
is available to view on the Trip History Screen at the bottom of the
screen.
(Trips of less than .2 miles are not saved.)
