Here is the description from the Owner's Manual...
Average fuel consumption (MPG or l
(liter)/100 km) and speed (MPH or km/h)
Fuel consumption:
The average fuel consumption mode shows the
average fuel consumption since the last reset.
Resetting is done by pushing the switch*B
for longer than 1 second. (The average speed is
also reset at the same time.)
The display is updated every 30 seconds. At
about the first 1/3 mile (500 m) after a reset, the
display shows “——”.
So, it is just an "average" based on the last 30 seconds or so of driving. Mine has been awfully close to the actual computations when filling up. Of course, I round off to the next increment ($$) so I probably don't get an exact read on gallons I put in.
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Jack 09 370Z
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