I was extremely disappointed in this as well. I was pretty concerned when my DVR didn't show any future listings as well. It is supposed to be back in December. I sent a message to discovery Channel about this... Here is there reply;
"Thank you for contacting Discovery Channel. We appreciate you taking the time to share your thoughts and concerns with us regarding “Top Gear.”
Your comments will be forwarded to our program management and executives and will be taken into consideration.
The "Top Gear" show was not "taken off the air" but rather ran its pattern.
It is being revamped for a U.S. audience and will return later this year.
Look for it in December.
A reply to this message is not necessary. For more information about schedules and programming check our website, www.discovery.com
If you have any further inquiries or comments, please contact us via our webform at http://extweb.discovery.com/ViewerRelations
Thank you again for expressing your interest in our programming.