I don't have the figures in front of me; they're buried in the CAHSR report. Obviously the route via Altamont would be a little longer for trips originating from San Jose. But it's unwise to make all of the decisions based solely on the end-points. If the only purpose were to connect downtown SJ to downtown LA, then the route shouldn't go through the Central Valley at all, but should instead drive straight down the coast, although that is the worst of all possible worlds -- not enough people and more expensive to build.