Arizona goes farther, apparently has a law that basically prevents manufacturers from releasing any information which might hurt the negotiating position of dealers. Needless to say, it's being challenged in court. Alliance of Auto Manufacturers v. Hull No. CIV 00-1324-PHX-PGR (D. Ariz. Apr. 30, 2001).
I've read the FTC Commissioner's report on state laws here, and an economic analysis report that both cite state lawmakers as the responsible parties:
1. http://www.ftc.gov/speeches/leary/learystateautodealer.shtm
2. http://www.justice.gov/atr/public/eag/246374.htm
Arizona goes farther, apparently has a law that basically prevents manufacturers from releasing any information which might hurt the negotiating position of dealers. Needless to say, it's being challenged in court. Alliance of Auto Manufacturers v. Hull No. CIV 00-1324-PHX-PGR (D. Ariz. Apr. 30, 2001).