The following dataset represents the highway fuel efficiency in miles per gallon
of 10 different car models:
```plaintext
27, 32, 25, 28, 31, 30, 29, 26, 24, 33
```
To calculate the average fuel efficiency of these car models, you would first sum up all the individual fuel efficiency values and then divide this sum by the total number of values in the dataset.
Sum of all individual fuel efficiency values:
```
27 + 32 + 25 + 28 + 31 + 30 + 29 + 26 + 24 + 33 = 275
```
Total number of values in the dataset: 10
Average fuel efficiency:
```
275 / 10 = 27.5
```
Therefore, the average fuel efficiency of these 10 car models is 27.5 miles per gallon.