Replacing about half of the steel-based materials in a car can reduce the weight of the car by almost 60%. This can lead to nearly a 30% increase in fuel efficiency. What kinds of materials could replace steel in cars? What would be the advantages and disadvantages in using these materials?

Elements Of Electromagnetics
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Replacing about half of the steel-based materials in a car can reduce the weight of the car by almost 60%. This can lead to nearly a 30% increase in fuel efficiency. What kinds of materials could replace steel in cars? What would be the advantages and disadvantages in using these materials?

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