391 dry gallons in US customary teaspoons
Result
The conversion result is: 391 dry gallons is equivalent to 349429.286233766 US customary teaspoons.[1]
Conversion formula
How to convert 391 dry gallons to US customary teaspoons?
We know (by definition) that: 1 drygallon ≈ 893.681038961039 usteaspoon.
We can set up a proportion to solve for the number of US customary teaspoons.
1 drygallon / 391 drygallon ≈ 893.681038961039 usteaspoon / x usteaspoon
Now, we cross multiply to solve for our unknown x:
x usteaspoon ≈ (391 drygallon / 1 drygallon) * 893.681038961039 usteaspoon → x usteaspoon ≈ 349429.28623376624 usteaspoon
Conclusion:
391 drygallon ≈ 349429.28623376624 usteaspoon

Conversion in the opposite direction
The inverse of the conversion factor is that 1 US customary teaspoon is equal to 2.86180935427091e-06 times 391 dry gallons.
It can also be expressed as: 391 dry gallons is equal to 1 / 2.86180935427091e-06 US customary teaspoons.
Approximation
An approximate numerical result would be: three hundred and ninety-one dry gallons is about three hundred and forty-nine thousand, four hundred and twenty-nine point two eight US customary teaspoons, or alternatively, a US customary teaspoon is about zero times three hundred and ninety-one dry 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.