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With recent debates, one frequently hears that it's currently not possible for car manufacturers to meet the 55 MPG energy efficiency rating required by 2025.

So, is there something physically impossible about meeting this standard? Is it achievable within the next 5 years? If not, what is preventing it?

Beliod
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It's more than possible. The 2020 Toyota Prius already claims it with 58 on the highway and 56 combined highway and city.

The limit is higher. Here is an article that covers a lot of details

Ack
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