Md AG Doug Gansler's threat to sue car rental companies for excessive per gallon charges - some "Don't Gas Up" charges were hitting $8 a gallon in Maryland - has brought some relief and an article about the practice in USA Today.   Gansler's move is generating discussion among his colleagues at this week's National Attorney General Association (NAAG) conference.  If the practice is not curtailed, I would expect other state AG's will act.