When compared to the price per gallon of other liquids gas is relatively modest. I would argue that whether the price per gallon of gas is modest should also be judged with regard to the volume consumed and the demand for that liquid.
Interesting to note that if my car, like my body, ran on coffee, purchasing 25 gallons of Folger’s home brewed coffee would only cost me $17.50. However, if I filled my car with Starbucks coffee at $1.86 / 16oz it would cost me $378.
Here are some prices per gallon for various liquids (link):
* Coffee – $0.70
* Gas – $2.70
* Milk – $3.79
* Eggs – 5.76
* Beer – $8.88
* Chocolate Syrup – $13.23
* RedBull – $30.69
* Robitussin DM – 109.76
* Scorpion Venom – $38,858,507.46