For long movies compression is sh*t. I top my discs at 4300MB, and (as an extreme example) The Godfather still needs 54.7% compression with only AC3 5.1-ch sound. Longer movies (2.5-3 hrs) almost always need a lot of compression. Pearl Harbor needed similiar compression.
Oh and since I first noticed the problem I've been doing movie only. It helps for some DVDs where they stuff in 3 gigs of extras, but for many it doesn't make a difference.
Is there an easy way to DVD shrink onto 2 discs?