Average retail gasoline prices in Missouri have fallen 1.1 cents per gallon in the past week, averaging $1.88/g Sunday, according to GasBuddy’s daily survey of 3,940 gas outlets in Missouri. This compares with the national average that has fallen 1.3 cents per gallon in the last week to $2.12 /g, according to gasoline price website GasBuddy.com.