To find the unit rate of miles per gallon, you can use the formula:
\[ \text{Miles per gallon} = \frac{\text{Total miles driven}}{\text{Gallons of gas}} \]
In this case, Lars drives 330 miles on a full tank of gas, which is 15 gallons. Plugging in these values:
\[ \text{Miles per gallon} = \frac{330 \text{ miles}}{15 \text{ gallons}} = 22 \text{ miles per gallon} \]
Therefore, Lars gets 22 miles per gallon.