While aluminum is making moves, steel is still the largest portion of the vehicle weight (by far) for most vehicles. Projects such as the Future Steel Vehicle have developed redesigns and new steels that resulted in a 39% vehicle weight reduction.
As an example, the frame for the 2019 RAM 1500 is comprised of four different types of steel as well as aluminum. It is currently the most weight-efficient frame in the light-duty truck market.
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