Hi Rick. I have been wondering the same thing for a while. I have not yet followed any of these leads and found the site that I was looking for. But I have not tried much. I have a few more spots like this that I hope to check out this fall. I am no expert, but I am guessing that their mileage estimates were not always very accurate. But I could be wrong (and it would not be the first time). Sorry I could not be of more help. Good Luck! your friend, Clint