My exercise physiology knowledge isn't great so excuse any missteps. Also excuse my lack of brevity, this is probably more than you wanted to know about blood and running.
Anemia in distance runners is kinda complicated partly because aerobic exercise increases plasma volume. This effectively dilutes your blood which improves oxygen delivery. This will lower to Hematocrit and Hemoglobin but you will not be truly anemic. This is why a lot of athletes have Hct/Hb on the lower side of normal (unless you are a pro cyclist visiting certain Italian doctors)
To better look at Iron store you should look at ferritin (a protein that stores iron) and % saturation of transferrin (a protein that controls free iron in your blood). If your ferritin or % saturation of transferrin is low, it's more indicative of lower iron.
SO, I looked for articles. I did not find anything that set a relationship between miles and iron stores or ranges of iron levels found in high mileage male runners. It's much more focused on Females.
One report looked at 35 male runners and found that while hemoglobin was slightly lower (still w/in normal), iron stores were normal. I could not get a copy of the paper so I don't know how much they were running.
Another report said 23 of 45 male runners were clinically iron deficient but again, I don't know how much they were running
The best report I could find here
. 4 of 12 high mileage males were deficient, it is also noted that they had similar iron intake. Of the 8 that were normal, they were well within the normal range, probably similar to that of someone that runs a lot less and higher than those typically associated with a pre-menopausal women (ferretin about 34-50 ug/l) .
So, I guess. There is definitely a trend for high mileage runners to be low on iron, it's not an absolute and probably the best way to figure it out would be a simple blood test. If you have any questions or if you want any more details or copies of the papers let me know. Also, lastly, it's not a great idea of a male to take an iron pill (outside of a regular multi-vitamin) unless under doctor supervision because it can delay detection or mask of certain medical issues,