Erm, probably mostly has to do with Acura being first alphabetically on the list.

It was Lexus for me. I figured it must be based on some insidious profiling.

from the bottom of the page:

>Our service is free to you but to operate this service, we are compensated by some of the providers.

It's more than likely that manufacturers aren't too excited about this. They like having control over pricing and this removes that to some extent.

They go to great lengths in order to make sure individual dealers play by the same rules (compliance) for this very reason.

Or it could just be that it's in alphabetical order, and defaults to the first one in the list.