In parts of the American West such as Salmon [Idaho], sharply higher fuel prices have prompted a growing number of school districts to save money by shortening the school week to four days.
School systems in such remote, sparsely populated areas, where school bus routes can stretch across many miles and take hours to complete, say far higher transport and other energy-related expenses are squeezing already shrinking budgets. link
Parents are concerned about the cost of daycare for Fridays, and schools are concerned that longer school days may make it harder to keep students engaged productively. However, many districts have successfully transitioned to the four-day week, saving money and giving teachers three-day weekends.