Gas prices steady

llinois, March 18- Average retail gasoline prices in Illinois have not moved in the past week, averaging $3.82/g yesterday, according to GasBuddy's daily survey of 4,378 gas outlets in Illinois. This compares with the national average that has fallen 1.9 cents per gallon in the last week to $3.65/g, according to gasoline price website GasBuddy.com.