Posted for "George Braly" <gwbraly@gami.com>:

 Bryan,
 
 14.1 gph is very doable with that engine.
 
 28" MP x 2100 RPM and 50F LOP would be about right.  It is very efficient and
very good for the engine.
 
 Regards,  George
 

"""
  My ES holds 92 gallons of useable fuel.  Considering 6.5 hours flight
  time he would be burning 14.1 gph.  I have the TSIO550E engine which is
  the same as the Columbia 400. I don't think I could or would run this
  lean.  Even considering the LOP procedures this is very lean in my
  opinion.  He must have had a great tail wind.  It would have been a
  great flight in a IVP during the same day.
  
  Bryan
  N132BB
"""