Owner's Manual
Page 294
... Owner's Maintenance Checks on fuel economy at speeds above 45 mph (75 km/h). For example: CONTINUED 291 2010 Insight Frequent cleaning helps your speed and you reduce the drag. Trailers, car top carriers, roof racks and bike racks are more efficient when warmed up of snow or mud on the engine, increasing fuel consumption...
... Owner's Maintenance Checks on fuel economy at speeds above 45 mph (75 km/h). For example: CONTINUED 291 2010 Insight Frequent cleaning helps your speed and you reduce the drag. Trailers, car top carriers, roof racks and bike racks are more efficient when warmed up of snow or mud on the engine, increasing fuel consumption...