Vacuum settings for mostly append-only data

Question

I have a table with the following characteristics:

1. We INSERT a few 100k rows each day
2. We never UPDATE the rows
3. We DELETE "old" data once a week

From my shallow knowledge of Postgres VACUUM, it seems like this table might be a good candidate for a non-standard VACUUM strategy. A few questions I have...

1. Apart from the weekly purging of old data, will a VACUUM do anything? Seems to me there is nothing to compact/clean if we're only doing INSERTs.
2. Would it be a horrible idea to simply disable AUTOVACUUM on that table and manually VACUUM FULL after our weekly DELETE?