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 in the tank.
Lars can drive 330 miles on a full tank of 15 gallons.
So, the unit rate is:
\[ \text{Unit Rate} = \frac{\text{Total Miles}}{\text{Total Gallons}} = \frac{330 \text{ miles}}{15 \text{ gallons}} = 22 \text{ miles per gallon} \]
Therefore, Lars gets 22 miles per gallon.