While the federal government massages the details of the 35-by-2020 CAFE standard into existence and the
EPA and California (along with other states) are in court over state-based CO2 emissions laws, regulators in California are moving ahead with proposals to force automakers to sell vehicles with a fleet average of over 40 mpg by 2020 in that state based on greenhouse gas emissions. Since at least 15 other states have signed on to California's auto laws, the California rules could mean that almost a third of the states in the U.S. (those that make up about half the U.S. new-vehicle market) would have laws much stricter than the federal CAFE standard. The auto industry - surprise - is vehemently against this proposal but the three remaining major presidential candidates, according to Automotive News, are in favor of allowing states to enforce their own greenhouse gas rules.
[Source: Automotive News]