389 imperial gallons in US customary cups
Result
The conversion result is: 389 imperial gallons is equivalent to 7474.71233634222 US customary cups.[1]
Conversion formula
How to convert 389 imperial gallons to US customary cups?
We know (by definition) that: 1 imperialgallon ≈ 19.2151988080777 uscup.
We can set up a proportion to solve for the number of US customary cups.
1 imperialgallon / 389 imperialgallon ≈ 19.2151988080777 uscup / x uscup
Now, we cross multiply to solve for our unknown x:
x uscup ≈ (389 imperialgallon / 1 imperialgallon) * 19.2151988080777 uscup → x uscup ≈ 7474.712336342226 uscup
Conclusion:
389 imperialgallon ≈ 7474.712336342226 uscup

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary cup is equal to 0.00013378441269746 times 389 imperial gallons.
It can also be expressed as: 389 imperial gallons is equal to 1 / 0.00013378441269746 US customary cups.
Approximation
An approximate numerical result would be: three hundred and eighty-nine imperial gallons is about seven thousand, four hundred and seventy-four point seven one US customary cups, or alternatively, a US customary cup is about zero times three hundred and eighty-nine imperial gallons.
Footnotes
[1] 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.