I don't think people who do the super long rides with a lot of climbing talk much about averages, because we know they really don't compute with most peoples' 50 mile and under or flat training rides. There's really no point in comparing the mph on long and/or very hilly rides - other than comparing one's own performances from one year to another. Every ride is different, are you working in a paceline, is it a ride where doing that is even all that helpful, etc.?
I have to say I don't think my averages are "miserable"!But i do like comparing from one year to another - which gets back to the OP about whether and how much one can improve one's own speed.
Point is - no one knows what terrain, conditions, whatever anyone is riding. Average MPH is basically worthless from one person to the next or one ride to the next - compare yourself to yourself.
Sarah
When it's easy, ride hard; when it's hard, ride easy.
2011 Volagi Liscio
2010 Pegoretti Love #3 "Manovelo"
2011 Mercian Vincitore Special
2003 Eddy Merckx Team SC - stolen
2001 Colnago Ovalmaster Stars and Stripes
I have to agree with MP. My averages won't mean anything to anyone else. It's not meaningful to compare my race to your solo ride, my flat ride to your hilly one, etc so there isn't any reason to say anything. I think there are probably a lot of women who think they ride slow that are very strong. They read some of these posts and get discouraged and I don't feel the need to be part of that.
(oh and to give you an idea about how much of a difference conditions can make.... my 20 something mile zone 1/2 recovery ride was accomplished at a faster "average" speed than my 101 mile mountainous race this weekend - now which do you think was the harder, more challenging ride..... even comparing me to me we're still talking about apples and oranges)
Just be aware that when you are talking club rides many of them aren't classifing rides on the average ending speed of the ride - they are talking about the average pace of the group on flat ground in ideal conditions! You may fit nicely into a faster group than you think.
"Sharing the road means getting along, not getting ahead" - 1994 Washington State Driver's Guide
visit my flickr stream http://flic.kr/ps/MMu5N