I'd personally go east from Gas City and hit highway 3 south to Greensburg and connect to 74 east from there. 3 is a straight road and minus New Castle and Rushville, it's all open highway as it bypasses around Muncie. Also between Muncie and New Castle, the speed limit is 60. Then take I74 east to Highway 1 South. BE CAREFUL though, most of the road has a 45mph speed limit and it's not very well marked. The troopers watch it like a hawk.