To find the unit rate of miles per gallon that Lars gets, you can divide the total number of miles driven by the number of gallons of gas in the tank.
Lars can drive 330 miles on a full tank that holds 15 gallons.
The calculation is as follows:
\[ \text{Miles per gallon} = \frac{\text{Total miles}}{\text{Total gallons}} = \frac{330 \text{ miles}}{15 \text{ gallons}} = 22 \text{ miles per gallon} \]
Therefore, the unit rate of miles per gallon that Lars gets is 22 miles per gallon.