Ok…Maybe the following answers my above questions. Someone posted this link (see below) on a recent thread. Excellent article. If I am interpreting it correctly than I think you do take a performance hit on b80 for the end fog setting of 88000UUs. That is you take a hit cause you are rendering way out to 88000UUs, but not because end fog is a non-power of 2.
Source: http://www.lilchips.com/dgunreal/ldro-tutterraindesign.asp
TerrainInfo.TerrainScale.X/Y versus ZoneInfo.DistanceFogEnd
The ZoneInfo.DistanceFogEnd property determines where the engine will start distance culling the terrain sectors*.
For a player positioned at the center of the map (origin X:Y of 0:0), depending on the size of the heightmap and TerrainScale/X/.Y, the DistanceFogEnd may be beyond the edge of the terrain and no distance culling will occur.
The following table lists the distance from a player at origin to the terrain edge, versus the maximum DistanceFogEnd value that will have any culling effect. This is for the common TerrainScale.X/.Y values of 256. All DistanceFogEnd values greater than maximum will simply render the entire terrain in the frustum when the player is at map center origin.
Additional methods of culling terrain sectors includes using AntiPortals.
Source: http://www.lilchips.com/dgunreal/ldro-tutterraindesign.asp
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