You can likely credit the fuel economy increase on the federal mandates for higher MPG ratings on new cars...
I'm not sure how likely that is. Seems to me that when gas is cheap, people buy big, powerful cars (e.g. SUVs) with little regard to fuel economy. When gas prices rise, people buy small economical cars. People buy what they think they can afford and makes sense for them, and automakers make more of what the customers are buying and less of what they are not buying.
I'm not sure how likely that is. Seems to me that when gas is cheap, people buy big, powerful cars (e.g. SUVs) with little regard to fuel economy. When gas prices rise, people buy small economical cars. People buy what they think they can afford and makes sense for them, and automakers make more of what the customers are buying and less of what they are not buying.