This kind of thing seems to be especially rampant in the auto industry. It's probably the result of a powerful lobby and widespread corruption.

When tires are tested, apparently the manufacturers are asked to send in the tires to be used in the tests. Why on earth would a tire testing entity do that, unless they are receiving bribes from the tire manufacturers? [1]

[1]: http://www.autoblog.com/2016/02/26/nokian-tire-test-cheat-re...