Join Date: Sep 2009
Location: SoCal (So. O.C.)
Bikes: Zinn road bike, Rockhopper MTB
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They are accurate in the same sense that "Ideal Height and Weight" charts are accurate.
They are guidelines and generalizations that don't take into account individual variations, like age, bone/frame size, individual metabolism, etc.
One way that they are useful is to notice the differences in kcals burned at one speed vs another or for a ride of one length vs another. It can help you decide whether you want to burn X number of kcals by riding harder for a shorter duration or spinning easier for a longer duration.
BTW, your BP & HR look good!