The fuel tank capacity of the 1999 GMC Sierra 1500 is 26 gallons. Its fuel economy is 13 miles per gallon in the city, and 16 miles per gallon on the highway.
25 gallons
The 1500 holds 25 gallons.
18 gallons
15.7 gallons
16 gallons.
900 gallons read a manual!
Seventeen gallons.
17 gallons
The tank should hold 11.9 Gallons
17 gallons
19 gallons
18 GALLONS