But we don't buy gas in 20-ounce servings.

From a KESQ article discussing the price of gas:

Let's put it in perspective.

Water, the planet's most abundant natural resource. It’s not uncommon to pay a dollar for a 20 ounce bottle from a vending machine or at a convenience store. With 128 fluid ounces in a gallon, that's more than $6 a gallon!

We see here that we can buy Polar water for $4.47 for six gallons. That's less than 75 cents a gallon. Seventy five cents does not equal more than six dollars.

And gasoline does not come out of a spout at our homes for about five cents a gallon, either.