But you do have a choice. The OEM's won't release their engine/dyno data. But you can read books on engines, and you can read the technical papers published by universities and research organizations, like the D.O.E. You can even read the little bit of stuff that the big 3 engineers do decide to publish. The engineers at the big 3 read all that stuff ... to see what else is going on in the world. They also look at what's being done in Europe/Japan, which you poo-poo. Believe me, they look at those engines in depth, buy them, run them, tear them down. But you'd have to want to be a hard core engine guy to go through all that stuff, it's a lot of work. Have a sweet weekend, baby!