PIB TIP: PERFORM REGULAR PM. Preventive maintenance ensures your truck is running efficiently. Check your current miles per gallon at each fill, and if it falls off, determine the reason. Check often enough to catch low oil, a dirty air filter or an air compressor leak. Don’t use a higher-viscosity oil than you need. The Partners in Business program is produced by Overdrive and the consultants at ATBS, the nation’s largest owner-operator business services firm, and is sponsored by Schneider National Inc. and Freightliner Trucks.