It would make sense though that the bigger the state (and longer the bus rides), the more it matters. It's definitely way less noticable and often times negligible. But I'd imagine Marion Local traveling to Coldwater has less of an effect than say, Defiance to Kenton or in the old days Lima Senior to Princeton. Even those are easier to overcome than a trip into any hostile college stadium, but the soreness from the bus rides is harder to shake off than staying close to home.
But I can honestly say as an alum of a school that's the geographical outlier in their league, there's still only a handful of games I recall thinking that we would have won if at home or lost on the road. A couple of Kenton or St. Marys games in the mid 2000s, and that's about it. It's mostly talent and coaching at the high school level.