I have worked out that for all of the best 1500/mile runners, 1500 time is equal to 800 time doubled, plus less than five seconds. Almost no exceptions. You can see the mathematical proof below.
LETSRUN POLL: IS YOUR 1500 PR WITHIN FIVE SECONDS OF YOUR 800 PR DOUBLED? (If not, you are probably more an 800 guy than a TRUE MILER!)
ASBEL KIPROP
1:43, 3:30
1:43 x 2 = 3:26
3:26 + 4 = 3:30
ALAN WEBB
1:44, 3:31
1:44 x 2 = 3:28
3:28 + 3 = 3:31
SEB COE
1:42, 3:30
1:42 x 2 = 3:24
3:24 + 6 = 3:30
STEVE OVETT
1:44, 3:31
1:44 x 2 = 3:28
3:28 + 3 = 3:31
STEVE CRAM
1:43, 3:30
1:43 x 2 = 3:26
3:26 + 4 = 3:30
(Note: times rounded to nearest second.)