Gas prices in the four states spiked higher after the storms and all have gasoline that costs more than $3.45 a gallon, according to AAA. In Illinois, it's approximately $4 a gallon, which is ...

Federal rules mandate the sale of low Reid Vapor Pressure gasoline during the summer months because a higher RVP evaporates more easily and can add to ozone pollution and smog. That is what is being ...

These rules are in place because high RVP gasoline evaporates more easily in heat and can exasperate ozone pollution and ozone-related health problems, according to the EPA.

Federal rules mandate the sale of low Reid Vapor Pressure gasoline during the summer months because a higher RVP evaporates more easily and can add to ozone pollution and smog.

Federal rules mandate the sale of low Reid Vapor Pressure gasoline during the summer months because a higher RVP evaporates more easily and can add to ozone pollution and smog.

Federal rules mandate the sale of low Reid Vapor Pressure gasoline during the summer months because a higher RVP evaporates more easily and can add to ozone pollution and smog.