Purdy point equivalents of current world records.
          At one time ? 1970 ? 1936?  all the world records
        had the same Purdy point value  950? (I think...)
This guy Haile Gebresilasie is the "Best".  Using the Purdy point system
here is the current men's world records with Purdy points and predictions
for other times using a 1108.38 Purdy score.
The 2nd best World record is the 400m by Harry Reynolds

Purdypts  Mile pace
1048.55 (00:02:38.52)     100m      9.85       Leroy Burrell     USA Lausanne
1087.47 (00:02:38.04)     200m      19.72a     Pietro Mennea     ITA Mexico C
1086.29 (00:02:38.12)     200m      19.73      Michael Marsh     USA Barcelon
1106.03 (00:02:54.17)     400m      43.29      Harry Reynolds    USA Zurich
1058.41 (00:03:24.64)     800m      1:41.73    Seb Coe           GBR Florence
1057.86 (00:03:32.72)     1000m     2:12.18    Seb Coe           GBR Oslo
1070.00 (00:03:44.08)     1500m     3:28.86    Noured. Morceli   ALG Rieti old
1083.59 (00:03:42.48)*     1500m     3:27.37    Noured. Morceli   ALG Rieti
1086.17 (00:03:44.39)     mile      3:44.39    Noured. Morceli   ALG Rieti
1056.58 (00:03:54.00)     2000m     4:50.81    Said Aouita       MAR Paris
1097.40 (00:03:58.77)     3000m     7:25.11    Noured. Morceli   ALG Monaco
1086.88 (00:04:09.54)     5000m     12:55.30   Moses Kiptanui
1108.38 (00:04:18.06)*    10000m    26:43.53   Haile GebresilasieETH Hengelo
1077.44 (00:04:34.84)     20000m    56:55.6    Arturo Barrios    MEX La Flech
1035.63 (00:04:45.54)     25000m    1:13:55.8  Toshihiko Seko    JAP Christch
1044.97 (00:04:47.46)     30000m    1:29:18.8      "       "      "      "
1092.06 (00:04:33.62)     half mar. 59:47      Moses Tanui       KEN Milan
1072.68 (00:04:50.25)     marathon  2:06:50    Belayneh Dinsamo  ETH Rotterda
1072.68 (00:04:50.25)     marathon  2:06:50    Belayneh Dinsamo  ETH Rotterda

   World record 10k   26:43.53 predictions
Results: dis(miles) = 6.213882 time = 00:26:43.53
lap(.4k)= 00:01:04.14 1k pace= 00:02:40.35 pace(mile)= 00:04:18.06
pf was  909.27 purdy 1108.38 p1 1078.63
VO2 = 78.16, which is 93.6% of VO2 max = 83.47 ml/kg/min
predicted times using pf, est. vo2max,     purdy,     purdy1
100M       00:00:11.68   00:00:12.53  00:00:09.61  00:00:09.57
400m       00:00:51.38   00:00:51.24  00:00:43.24  00:00:43.46
440yd      00:00:51.70   00:00:51.55  00:00:43.55  00:00:43.76
500M       00:01:05.22   00:01:04.51  00:00:56.82  00:00:56.56
800m       00:01:47.79   00:01:45.37  00:01:39.19  00:01:39.54
880yd      00:01:48.46   00:01:46.01  00:01:39.88  00:01:40.24
1k         00:02:16.83   00:02:13.43  00:02:08.80  00:02:10.32
1500M      00:03:31.06   00:03:26.23  00:03:24.71  00:03:30.65
1600M      00:03:46.13   00:03:41.18  00:03:40.35  00:03:46.92
1mile      00:03:47.54   00:03:42.57  00:03:41.79  00:03:48.44
3K         00:07:22.77   00:07:20.59  00:07:22.50  00:07:33.99
3200M      00:07:54.39   00:07:53.04  00:07:54.71  00:08:06.21
2mile      00:07:57.33   00:07:56.05  00:07:57.70  00:08:09.24
steeple    00:08:02.31   00:08:01.16  00:08:02.76  00:08:14.28
5k         00:12:44.39   00:12:49.35  00:12:46.38  00:12:57.08
5mile      00:21:11.10   00:21:16.15  00:21:11.70  00:21:17.14
10k        00:26:43.56   00:26:43.41  00:26:43.62  00:26:43.62
10mile     00:44:26.56   00:44:05.58  00:44:25.03  00:44:12.50
half mar   00:59:18.79   00:58:42.70  00:59:12.06  00:59:09.47
marathon   02:04:25.75   02:03:03.91  02:04:12.13  02:08:57.95