I think you'll see more applications cut to 15,000 miles, just give it some time. There is only so much junk you can pack into a filter. Some engines have more junk in them than others. Some engines produce more junk. What is good for one vehicle might not be good for all vehicles, even if they are identical and used in the same way. There are to many variables, so changing a filter a little sooner might be a smart idea, than trying to push the limits. JMO