As the title says; the Vasari's Gravitic Tolerance research is supposed to make the ships able to jump out of gravity wells before actually reaching the edge of it. With v1.05, I distinctly remember Vasari ships and fleets being able to do so. With the last two Beta versions, it appears to be no longer the case - ie. the research doesn't seem to have any effect at all any more.
The following screenshots show my fleet in the proces of jumping, after I've reseached both levels of Gravitic Tolerance.
