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Please note that the tenth points in the output under 'Service Load moments and Shears' are referenced with respect to the centerline of the left bearing. Let us follow a sample calculation using Tutorial 1 in the manual. Precast Length is 116.0 ft. Now 0.4L = 0.4 x 116 ft = 46.4 ft. However under Shear and Moment envelopes program shows a value of 45.90 ft. This difference of 0.5 ft comes from the overhang over bearing CL. Since the program always assumes that the beam is placed symmetrically over the bearing, this overhang is calculated as (Precast Length (116.0 ft) - Design length (115.0 ft)/2 = 1.0/2 = 0.5 ft.