The SI unit used most commonly for gasoline is the liter. The price, at a glance, may seem cheap to your average American, but there are 3.78 liters for every gallon.
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The SI unit that best describes the volume of gasoline in a car is the liter (L). It is commonly used to measure the quantity of liquid substances like gasoline.
volume
The liter is the standard unit for measuring volume in the metric system. It is commonly used to measure the volume of liquids such as water, milk, and gasoline.
Density is not a descriptive word but a property of materials. Therefore, a material can have a high or low density. Density has units of unit mass per unit volume. "Specific volume" has units of unit volume per unit mass, so it is sort of an opposite. No real antonyms for "density" in the English langauge... some sense of "insubstantial" might work.
I would use litres.
A litre is a unit of volume.