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it's a bit disingenuous to say that 'aluminum is 50% the weight of steel' or 'aluminum is 1/3 the weight of steel' when referring to car parts, since this does not imply that an aluminum hood will actually weigh half as much as a steel hood.
as an example of what i mean, look at a copper radiator vs. an aluminum radiator. copper is significantly heavier, and also more expensive than aluminum. but you can make an efficient copper radiator using less copper than you'd have to use of aluminum for similar heat dissipation results. copper is more than 3 times heavier than aluminum, and about that much more expensive too, yet an aluminum radiator doesn't really weigh 1/3 of what a copper radiator weighs. at best, it might weigh half, but typically closer to 60%
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