On a car, the easiest and most practical way is to find it in the owner's manual.
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It depends what size tank you have. If you know how many gallons a full tank holds, then multiply that number by 0.84; the answer is how many gallons are in it now.
12 gallons
The tank will hold a maximum of 478.753 gallons of fuel.
150
according to the website I found, a 1994 Grand Am has a fuel tank capacity of 15.2 gallons