Yes, bmg002.
I am storing the results in "tempdb_usage" table in utility database.

Kevin / bmg002,
It very well might be the case that we have a lot of open transactions.
I use this Paul Randal query to find opened transactions.
I don't see any transaction where [Begin Time] is greater than 1 minutes ago.


/***** http://www.sqlskills.com/blogs/paul/script-open-transactions-with-text-and-plans/  ****/
use tempdb

SELECT
  [s_tst].[session_id],
  [s_es].[login_name] AS [Login Name],
  DB_NAME (s_tdt.database_id) AS [Database],
  [s_tdt].[database_transaction_begin_time] AS [Begin Time],
  [s_tdt].[database_transaction_log_bytes_used] AS [Log Bytes],
  [s_tdt].[database_transaction_log_bytes_reserved] AS [Log Rsvd],
  [s_est].text AS [Last T-SQL Text],
  [s_eqp].[query_plan] AS [Last Plan]
FROM
  sys.dm_tran_database_transactions [s_tdt]
JOIN
  sys.dm_tran_session_transactions [s_tst]
ON
  [s_tst].[transaction_id] = [s_tdt].[transaction_id]
JOIN
  sys.[dm_exec_sessions] [s_es]
ON
  [s_es].[session_id] = [s_tst].[session_id]
JOIN
  sys.dm_exec_connections [s_ec]
ON
  [s_ec].[session_id] = [s_tst].[session_id]
LEFT OUTER JOIN
  sys.dm_exec_requests [s_er]
ON
  [s_er].[session_id] = [s_tst].[session_id]
CROSS APPLY
  sys.dm_exec_sql_text ([s_ec].[most_recent_sql_handle]) AS [s_est]
OUTER APPLY
  sys.dm_exec_query_plan ([s_er].[plan_handle]) AS [s_eqp]
ORDER BY
  [Begin Time] ASC;
GO


Typically I get 1-2 records.
Sometimes 10-15 (every 1 minute) like below: