well after doin some searching and reading i have came up with different amounts the factory tank can hold..16 gallons.16.6 and 17..now i think my gauge is off by a bit because when i put 10 dollars in wich is about 3.75 gallons..it reads i have a 1/2 tank(or very close)..so by my gauge logic that would mean i have a 6 gallon tank."that would be like 60 miles on a tank"...any info would be great,or a finger pointing in the direction..thanks all....454 coming soon