How about considering a different format?
How about a desktop background that is a functional calender that rotates through LOTS of different Grassroots and other car pron?- go ahead and throw in the sponsors logos. Or maybe an app that resides in the dock, and opens each time with different car pics and sponsors.
THAT is a calender I would use.
As others have noted, the modern day value of a wall calender is questionable, and the printing costs are high. This would solve both issues, and give sponsors a direct visual every time I turn on my computer. If it rotated sponsors, it would also give you the opportunity to sell it to more sponsors.
I also have the wall calender on my wall. I also like the pics of lower cost creative cars a bit more.
I also greatly appreciate the staff's effort. 
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