 That money came from the NBA, corporate partners, and the 81,000 visitors, over half of which came from outside of Marion County. Sam Fritz, Network Indiana. And $3.58 is the statewide average for a gallon of gas in Indiana to start the week. According to GasBuddy.com, prices have declined for five straight days, but are still 10 cents above the national average. The cheapest gas in South Bend is $3.17 a gallon. In Elkhart, it's $3.09.