How does this look?

PHP Code:
Overall OGR-27 PProxy stats based on 95 active days:

    Smallest:     7.37 Gnodes (27/1-20-7-60-3-2), submitted on 18/08/2009
     Largest: 1,079.32 Gnodes (27/1-20-9-2-24-38), submitted on 08/09/2009
   Avg. stub:   158.92 Gnodes
   Avg. rate:    1,966  G/day, 0.02 Gnodes/sec, 12 stubs/day
 Most Gnodes:    8,102 Gnodes, 0.09 Gnodes/sec, on 20/08/2009
  Most stubs:      135  stubs, 6 stubs/hour, on 18/08/2009

       Total:  186,726 Gnodes, 1,175 stubs (0.00019% of project) 
or

PHP Code:
Overall OGR-27 PProxy stats based on 95 active days:

    Smallest:     7.37 Gnodes, submitted on 18/08/2009 --> 27/1-20-7-60-3-2
     Largest: 1,079.32 Gnodes, submitted on 08/09/2009 --> 27/1-20-9-2-24-38
   Avg. stub:   158.92 Gnodes
   Avg. rate:    1,966  G/day, 0.02 Gnodes/sec, 12 stubs/day
 Most Gnodes:    8,102 Gnodes, 0.09 Gnodes/sec, on 20/08/2009
  Most stubs:      135  stubs, 6 stubs/hour, on 18/08/2009

       Total:  186,726 Gnodes, 1,175 stubs (0.00019% of project) 
I'm not completely convinced yet that it looks OK. I tried your suggested format but it looked a bit strange, especially with the new dynamic spacing code that I introduced in the last release.

I've toyed with the idea of making it an optional component, enabled by a command line flag. Maybe I'm putting too much thought into it.