What is the differance between urban driving -extra urban driving and -combined driving?
Answers:
urban driving is driving in town/city
extra urban driving is the new phrase for driving in the country and
combined driving is the average mpg of both of the above.
This is how they come up with the fuel efficiency figures for cars.
Urban driving simulates driving through a town or city, with a lot of stop-starts and a max speed of about 30 mph. Extra-urban driving simulates driving on the open road. Combined driving combines the two, although not in equal proportions, to give an estimated overall fuel economy figure for a normal balance of driving.
You must remember that all these figures are gathered from vehicles on rolling treadmill type test-beds, and so wind resistance is not taken into consideration. As such, you are unlikely ever to match the quoted figures for you particular car. As a means of comparing the fuel economy of one car with another, such figures do provide useful information, however.
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