We here at Save Point Online were late to sign up for the Xbox LIVE Update Preview Program, but after receiving it today I was interested in checking out how much smaller the game installs really were.
My initial test was really surprising when Dark Sector installed at 1.3 GB. That's a 61.8% decrease in used hard drive space over the original 3.4 GB pre-update install.
The second test was a bit less when Bioshock installed at 4.7 GB. That one was 23% smaller that the pre-update install.