Marty Shepherd worked on the engine under a 78-passeger diesel bus in the Fayette Co. school bus garage, 780 Miles Point Way, in Lexington, Ky., Monday, August, 13, 2012. Classes begin Wednesday for Fayette Co. students. Drivers and their assistants have already been making dry-runs of their routes. The buses are also receiving last minute maintenance in the bus garage. The buses average 7-7 miles per gallon on diesel fuel. Photo by Charles Bertram | Staff CHARLES BERTRAM — Herald-Leader Buy Photo