MGS4 framerate ~27 FPS average.

[leo-j]

Ok so the developer konami was full of $hit when they said MGS4 runs at 60fps, just because squillium has been constantly attacking this game means nothing:

http://www.gamecollision.com/news/metal-gear-solid-4-qa-runs-60fps-720p-possible-1080p-more#comment-2339