My friend with the 87IV sent me his findings.
VACrms Voffset AC Reading Vrms Reading DC (V) Notes
0.1 0 0.09997 NA AC mV Scale
0.1 1 0.09999 NA AC mV Scale
0.1 2 0.09997 NA AC mV Scale
0.1 3 0.09996 NA AC mV Scale
0.1 4 0.09998 NA AC mV Scale
0.1 5 0.09997 NA AC mV Scale
0.1 6 0.09998 NA AC mV Scale
0.1 7 0.09995 NA AC mV Scale
0.1 8 0.09994 NA AC mV Scale
0.1 9 0.09993 NA AC mV Scale
0.1 9.859 0.09992 NA AC mV Scale
0.1 0 0.09987 0 DC or Pulsed mV Scale AC on Main, DC on 2nd
0.1 0.5 0.1 0.501
0.1 1 0.1001 1.003
0.1 1.09 0.1 1.094
0.1 1.097 OL OL
0.1 0 0.0999 0.00003 DC or Pulsed mV Scale DC on Main, AC on 2nd
0.1 0.5 0.0999 0.50085
0.1 1 0.1 1.0031
0.1 1.09 0.1 1.0934
0.1 1.097 OL OL
Very impressive but he did not try reading the DCmV with higher AC levels. I did get to hear heard again about how crappy the 87V was by comparison.