The government groups found that the auto industry has been doing a good job innovating and pushing towards lowering greenhouse gas emissions. The paper says the technology is cheaper or about what was expected in terms of cost, and that automakers are adopting new technologies quicker than expected. Still, the paper says that the 54.5 mpg-equivalent projection is unrealistic. That goal was based on a market that was 67 percent cars and 33 percent trucks and SUVs and higher fuel prices. American customers aren't buying that many cars—the market is still about 50/50 and will likely stay that way. The paper says more realistic projections are 50 mpg to 52.6 if the 2012 standards are maintained.