Has anyone replaced the front end piece with one that is further off the ground? If so, how much shorter is it? One inch? Also, how is mileage affected? How much does it cost?

Thanks

Some of the information you are asking for is found at this thread... (http://gm-volt.com/forum/showthread.php?8840-Dealer-can-t-find-the-short-air-dam-part)...including cost.
VM

...and here is the link (http://gm-volt.com/forum/showthread.php?8594-Tale-of-Two-Air-Dams) with what one member found when he switched out the air dam.
VM

Thanks voltmama. I'm getting put on.

Thanks voltmama. I'm getting put on.
I am glad I could help...it is fresh in my mind because I wanted to know about it in case I need to get it!