0m.wav - a wav file created from 16M of zeroes as 44100/mono
0s.wav - same, but 44100/stereo
0m.mp3/0s.mp3 - created from corresponding wavs with lame defaults
0mv.mp3/0sv.mp3 - created in VBR mode (--vbr-new)

mpz = mp3zip
mpy = mp3zip -c (lossy)
pmp = packMP3_09b3

[0m.mp3]  1522415 0.250s 0.235s mpz:  1461
                  0.093s 0.078s mpy:   424
                  0.422s 0.625s pmp: 41846

[0mv.mp3]  757953 0.172s 0.156s mpz:   854
                  0.078s 0.079s mpy:   301
                  0.235s 0.343s pmp: 35831

[0s.mp3]  1523042 0.234s 0.219s mpz:  1377
                  0.078s 0.078s mpy:   355
                  0.391s 0.625s pmp: 26795

[0sv.mp3]  379289 0.110s 0.109s mpz:   740
                  0.094s 0.078s mpy:   329
                  0.125s 0.171s pmp: 17767