the direction this industry is going...IMO...MPG's first...keep that CPM as low as you can...that is IF you want to make a "reasonable" living at this....
Most of that is here in the 2014
http://www.myvan.com/2013/11/14/the-new-sprinter-%E2%80%93-all-round-economy/
http://www.myvan.com/2013/11/28/the-new-sprinter-%E2%80%93-simplify-the-day/