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The energy needed for hiking is not proportional with the speed you walk. Walking on a smooth surface, you can expect to expend the following amount of energy per each 100 pounds: 2 mph = 45 calories; 3 mph = 90 calories; 4 mph = 160 calories. The energy needed to increase your speed doubles with each extra mile per hour. Therefore, hiking at a slower rate will allow you to cover a further distance with the same energy.