or, you could estimate it fairly accurately using the following formula:
(fuel tank capacity - gallons needed to fill tank when gas light turns on) * (average miles per gallon)
I have about 4 gallons left when the light turns on. 2 gallons left when the needle dips below the "empty" line. The emptiest my tank has ever been is 0.5 gallons left.
I have about 4 gallons left when the light turns on. 2 gallons left when the needle dips below the "empty" line. The emptiest my tank has ever been is 0.5 gallons left.