Subaru 2005 Legacy Owner's Manual page 213

Instruments and controls
Canada-spec. vehicles U.S.-spec. vehicles
The driving range indicates the distance that can be
driven taking into account the amount of fuel remain-
ing in the tank and the average rate of fuel consump-
tion.
When the low fuel warning light comes on, the driving
range indication flashes for five seconds. (The display
first switches to the driving range indication if it was
originally giving some other indication.)
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