START's reply

===> Convert 80 ounces to gallons.

There are 0.62 gallons (US liquid) in 80 ounces (US fluid).

If the above didn't answer your question, you can select a query below. Among units of volume, I know about two ounces and three gallons.

Which ounces do you mean?

ounce (US fluid)
ounce (UK fluid)

Which gallons do you mean?

gallon (US liquid)
gallon (US dry)
gallon (UK liquid)

Source: START KB