In America, we measure fuel efficiency of our cars by citing the number of miles
you can drive on one gallon of gas (mi/gal). In Europe, the same information
is given by quoting how many liters of gas it takes to go 100 km (li/100 km).
- My current car gets 21 mi/gal in highway travel. What number (in li/100 km) should I give to my Swedish friend so that he can compare it to his Volvo?
- The car I drove in England last summer needed 6 liters of gas to go 100 km. How many mi/gal did it get?
- If my car has a fuel efficiency, f, in miles/gallon, what is its
European efficiency, e, in liters/100 km? (Write an equation that would
permit you to make an easy conversion from one to the other or back.)
- The fact that the US figure, f, and the European figure, e,
are inverses mean that they behave differently. Suppose you compare three
cars: an SUV that gets 10 mi/gal, a compact car that gets 20 mi/gal, and
a hybrid that gets 35 mi/gal. Make a guess as to which transition
will save you more money: changing from the SUV to the compact or changing
from the compact to the hybrid? Assuming that gas costs $4/gal and you
drive 1000 mi/month, which transition would save you more money? Calculate
the European values for these three cars. Which
figure, e or f gives
you a better idea of which shift will save you more money? Explain why.
Not finding what you wanted? Check the
Map for more information.
Page last modified
September 4, 2008: G04