How to convert 491 US gallons to US customary cups?
We know (by definition) that:
We can set up a proportion to solve for the number of US customary cups.
Now, we cross multiply to solve for our unknown :
Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary cup is equal to 0.000127291242362525 times 491 US gallons.
It can also be expressed as: 491 US gallons is equal to US customary cups.
An approximate numerical result would be: four hundred and ninety-one US gallons is about seven thousand, eight hundred and fifty-six US customary cups, or alternatively, a US customary cup is about zero times four hundred and ninety-one US gallons.
 The precision is 15 significant digits (fourteen digits to the right of the decimal point).Results may contain small errors due to the use of floating point arithmetic.