What does extra urban mean when talking about MPG?

Related questions

1. What is urban driving mean?
2. Is a lower mpg better?
3. Does Tesla use brushless motors?
4. In what year will WLTP apply to all new cars produced?
5. Are brushless motors AC or DC?
6. Are Tesla Motors AC or DC?
7. Why AC motor is better than DC?
8. Do Teslas need oil changes?
9. Do Teslas need motor oil?
10. What motors do Tesla use?

Tags

1. #gallon
2. #efficiency
3. #measures
4. #imperial
5. #driving
6. #miles
7. #extra
8. #single
9. #environments
10. #vehicle
11. #number
12. #environment
13. #motorway
14. #urban