Poll Results

Total votes: 2056

6: 294 (14.3%)
5: 271 (13.2%)
3: 268 (13.0%)
10-11: 196 (9.5%)
7: 180 (8.8%)
4: 163 (7.9%)
8: 163 (7.9%)
9: 137 (6.7%)
2: 71 (3.5%)
12-13: 54 (2.6%)
>99: 54 (2.6%)
14-15: 38 (1.8%)
20-24: 37 (1.8%)
0: 26 (1.3%)
50-99: 23 (1.1%)
16-17: 19 (0.9%)
30-39: 19 (0.9%)
1: 14 (0.7%)
40-49: 12 (0.6%)
25-29: 11 (0.5%)
18-19: 6 (0.3%)

If I assume everyone who voted for >99 knows 100 digits, and assign the average value for the ranges, then I calculate that Irregular Webcomic! readers know π to a mean of 10.54 digits. If any of the folks who voted >99 know it to significantly more, then this value could be somewhat higher. I bet the average Garfield reader doesn't know π to more than 10 digits!