Battery life seems diminished after 10.6.3 update

My battery power seems to be diminished quite a bit since the 10.6.3 update. I used to get between 3 and 4 hours when just web surfing and email (nothing else active) and the screen brightness turned down to about 60%. Since the update I'm getting closer to 2.
I did a battery recalibration but still only getting around 2 hours on a fully charged battery.
Istat says:
Health: 95%
Cycles:488
I've had the MBP for about a year and 5 months. Is it natural to get this sort of diminished performance?
Thanks
M.

My system does not require that "fix". It does not show up in my software update.
If you read down on that site you will see this:
Here's what's changed
"In order to receive all the improvements listed above, some systems require the Mac OS X v10.6.3 Supplemental Update, which is available via Software Update.
_Tip: If you don't see the Mac OS X v10.6.3 Supplemental Update in Software Update, you don't need to install it._
Note: The Supplemental Update is for any system that was updated from Mac OS X v10.6 using the Mac OS X Update Combined v10.6.3, build 10D573. It is not needed on systems that were updated from Mac OS X v10.6.1 or 10.6.2, and it is not needed on systems that were updated from Mac OS X v10.6 using the Mac OS X Update Combined v10.6.3, v1.1."

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