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With the bearings tightened against the sleeve (assuming the sleeve is machined 100% parallel) the bearings are now 100% true and held 100% parallel to each other. Where if there wasn't a sleeve...

Like I said a friend (owns a large company that does stuff like this) build a dyno to test the rolling friction of the wheel/hub assembly and tested just about everything out there.

The grease was...

Grease was dead last on things that effected the rolling resistance, so far down the list it's doubtful it has any effect on the car at all. The amount of grease had more effect on it, then the type...

http://www.4m.net/showthread.php?398452-Wide-5-bearings&p=2337102#post2337102

Note: I listed #2 and #3 backwards, sorry

On a side note: You will gain more speed/lap time reduction in testing at...