Calling the Brown administration's new climate change goals "aggressive," the Western States Petroleum Association plans to cautiously enter a debate this year about how California could cut gas consumption in automobiles by up to 50 percent over 15 years. Calling the Brown administration's new climate change goals "aggressive," the Western States Petroleum Association plans to cautiously enter a debate this year about how California could cut gas consumption in automobiles by up to 50 percent over 15 years.