Honda 2009 Ridgeline Owner's Manual page 94

Multi-Information Display
Along with the trip meter, the trip
computer calculates these values:
Average Fuel Economy
Range
Average Vehicle Speed
Elapsed Time
Instantaneous fuel mileage
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AVERAGE FUEL A/B
This shows your vehicle's average
fuel economy in mpg (U.S. models)
or liter/100 km (Canadian models)
since you last reset Trip A or Trip B.
RANGE
This shows the estimated distance
you can travel on the fuel remaining
in the fuel tank. This distance is
estimated from the fuel economy
you received over the last several
miles(U.S.) or kilometers (Canada),
so it will vary with changes in speed,
traffic, etc.
AVERAGE SPEED A/B
This shows the average speed you
are traveling in miles per hour (mph)
for U.S. models or kilometers per
hour (km/h) for Canadian models.
ELAPSED TIME A/B
This shows the time passed traveled
since you last reset it. When you turn
the ignition switch to the ON (II)
position, ELAPSED TIME is reset.
INSTANT FUEL MPG (U.S.
models)/INSTANT FUEL L/100 km
(Canadian models)
This shows your current fuel
mileage.