Yellow buses will roll as planned this year, but fuel costs will burn a bigger hole in education budgets for big and small districts from Cheney to Coeur d'Alene. For wide-open rural districts like Cheney Public Schools, which covers an area the size of Dallas at 378 square miles for 3,500 students, the prices add up fast – potentially a $200,000 fuel bill. The district purchases up to 75,000 gallons of diesel a year to run 47 buses that rack up 550,000 miles annually.