I only drive 30 mi to work roundtrip each day and my battery is fine. 4 yr 2 mo, 68K miles.
I've been monitoring the voltage and it's down to 12.2V so I just ordered a CTEK 3300 battery charger/tender from Amazon to see if my battery is really on its last legs, or low due to the short commute. I also accidentally resetted the battery adaptation, so it may be undercharging? I forget if new batteries charge at a higher or lower voltage. I assume lower.
http://www.amazon.com/CTEK-Multi-Sma...7316572&sr=8-1