Manual-transmission cars typically average 1-2 miles per gallon better than their automatic-transmission counterparts. Assume there are about 260 million cars in the U.S. and that 90% are automatics. (a) How much gasoline would we save each year if all drivers of automatics switched to comparable manual-transmission cars? Assume an average mileage of 25 mpg for manuals and 23 mpg for automatics.
On the average a car travels a distance of per year .
There are cars in U.S.
Number of automatic cars are
Number of manual cars are
Mileage of automatic car is and mileage of manual car is
So the amount of usage of gasoline by an automatic car in one year is
The amount of usage of gasoline by a manual car in one year is
Total usage of gallons by automatic and manual cars is
If all the automatic cars are switched to manual cars, the usage of gasoline by all the manual cars is
Amount of gasoline save by swiching the automatic cars to manual cars is
that is million gallons can be saved.
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