I akin it the following here in Australia.
Ford brings out a new 4 cylinder Mustang, however they market it and stick V8 badges all over it.
The car experts know that inside it's actually just a 4 cylinder and makes the informed choice.
To the common person who hears about and sees this new Mustang thinks "oh look, V8 badges, it's a V8, it must be so quick and on par with other V8's on sale." Subsequently goes off to purchase one.
Ford says, well we think our car is just as fast as a v8 thereby it MUST be a V8.
General Motors, Chrysler and other car companies knowing that marketing is the key to their next Christmas bonus all lower the requirements to call a V8 a V8 in America, (and push it across the world) saying that a V8 doesn't need to be a v8 and well a V6 can be a V8 too as it's too expensive to make a new V8 power-plant.
Australia says, hang on a second. We have pretty clear cut definitions for V8's. A V8 is a V8 and get's marketed as such here, we have real V8's rolling around going pretty quick and have been a major investment by one company who went and built a new V8 network. Sticking a V8 badge on a 4 cylinder is poor form and the average Australian Joe is going to get sucked in not knowing any better. We are going to sue you on behalf of the Australian people for being jerks.