What changes in the 1970s and 1980s made cars more energy efficient?
A. improvements in engine design and weight reductions in cars
B. more use of fossil fuels
C. making heavier cars
What changes in the 1970s and 1980s made cars more energy efficient?
A. improvements in engine design and weight reductions in cars
B. more use of fossil fuels
C. making heavier cars
@Physics

Question

What changes in the 1970s and 1980s made cars more energy efficient?
	A.	improvements in engine design and weight reductions in cars
	B.	more use of fossil fuels
	C.	making heavier cars
 What changes in the 1970s and 1980s made cars more energy efficient?
	A.	improvements in engine design and weight reductions in cars
	B.	more use of fossil fuels
	C.	making heavier cars
 @Physics

anonymous · Answer

it is A. improvement in engines results in the maximum efficiency from the fuel...

anonymous · Answer

it will be A, But the improvement of engines will heavier the weight of the car