This is regarding what seems like an issue with 2002 Prius that has about 3000 miles. When I drive the car uphill, the car struggles to climb and maintain / gain speed easily. The speed limit at that part of the road is 45 mph, which Camry and Corolla seem to climb relatively more easily. Also, when I step on the gas for accelerating the car, it becomes noticeably noisy. Is there any thign I am doing wrong? or is this normal for Prius? Should I take this to a dealer for inspection? Any help / suggestions would be gratefully acknowledged. Thanks in advance.