My take away from this: If you normally develop your film within 1 to 4 days after shooting, do formal tests 1 to 4 days after exposing the test film. This will give you an EI that will work for real world use. If you are going on a long trip and can't develop film for a month, you may have to give a slight boost to exposure (or corresponding drop in film speed). But, a drop from EI 71 to EI 65 is within my margin of error.

If you don't want to wait to do tests, (such as with BTZS tests where you expose film under the enlarger and can move directly to development), then be aware your EI may be a bit generous. But, you should be making the necessary adjustment anyway following the last step in BTZS testing--Field Testing.