I have to agree that it should say where the data is from .. if its
available online a link should be given too.

Not to suggest that here but often data that is without all the article
can be misleading ..

The Merc in this case has 5% more HP which is hardly noticeable .. The
thing is that you cant conclude that mers have more HP than rude... If
you test 2 different motors it may look the otherway round as there are
differences in each motor.

The data would only valid if a certain population of motors, lets say
10 was tested. From that data you could see SD and average HP. That
comparison would be more meaningful.

Matt