New corporate average fuel economy standards are completely unnecessary.
If consumers deem it important to purchase vehicles that attain high gas mileage, they will do so. If automotive companies keep a finger on the pulse, they should be anticipating that long-term trend.
The companies that anticipate consumer demand best will sell the most cars. No rocket science there. All things being equal, it should not surprise anyone that consumers prefer high-mileage to low-mileage vehicles.
The important underlying philosophy should be to let customer demand drive the market.
Government bureaucrats cannot and should not decide what our future cars should look like.