Funny..I always read these threads all the way through...trying to see if the symptoms match my driving behavior and distances. I've got a basically fully loaded 2007 4.8i and my commute to work (one way) is about 5 miles. Sometimes, I wont go anywhere but work and back for weeks on end. NEVER had an issue with the battery. I bought it CPO and looked at the maintenance records and nothing mentioned anything about the electronics nor the battery.

Left it sitting for 6-8 days twice since I've bought it (bought Jan 2011) while on vacation and also was fine when we got back.

Must be I've got a lucky one? Watch, when I try to go to work tomorrow, it's dead now that I said something...