The weather does influence things pretty heavily. I lose 3 tenths in the summer versus fall/winter.
What are your mods? Those are really good times for a stock converter. Even more amazing is that it has held up.
96 v8 4.6 explorer, kooks headers, off road x, magnaflow mufflers, cl tb/plenum, lmaf, gt tube, xcal tune, alum shaft, 3800 dirty dog converter, darrin trans, 373 gears, hoosier slicks on fanblades, pbr brakes, Skinnies on front, No PS or AC, Aeromotive EWP, major weight removal (3380 LBS), 12.78 OLD COMBO.