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12.7 gallons
I think 14.4 US Gallons in a 2002 Pontiac Grand AM. It should also say how big your fuel tank is in the owners manual.
18 gallons
16.5 gallons.
20 gallons of gas
15
17
according to the manual it holds 16 gallons
normally twelve
According to GM and www.feuleconomy.gov, the 2008 Pontiac Grand Prix has a 17 gallon gas tank.
The 1991 Pontiac Grand Am gets 19 miles per gallon in the city, and 30 miles per gallon on the highway. It can hold up to 13.6 gallons of gas.
17.1 gallon 16 gallons usable