Take a look at this link...

http://en.wikipedia.org/wiki/Carburetor_heat

We can debate from here to eternity and second guess the engineers that designed these cars and trucks that we play with. If any of us wants to reinvent or re engineer their vehicle so be it and more power to you. The other side of the coin is to accept the way things have been designed and manufactured and enjoy them.
I enjoy hearing about both sides of the fence on an issue but in the end each of us should make the decision that her or she is happy to live with. I'm not interested in splitting hairs and being demeaned by a blowhard.
Its the holiday season....relax, enjoy and be happy. Get your Santa boots on and pull em up.

Don