On average, including retiree benefits (which Honda, Toyota, etc. don't have to pay yet because they haven't been here 30 years yet and thus have no retirees), U.S. automakers pay $606 more per car in labor costs than Toyota/etc.'s , but this number will be reduced to $97/car once the UAW takes over the retiree health plan in 2011. GM's UAW plants appear to be more efficient than Toyota's non-UAW plants, thus giving the lie to the notion that "the UAW makes GM pump up their employment numbers" -- GM, for example, put 22.19 man-hours of assembly labor into each car last year, while Toyota put 22.36 man-hours of assembly labor into each car. See the graph on page 8 of the above-named report.
In short, saying that unions "bloat up the workforce" does not appear to be true for GM at least. The UAW is well aware that they must be competitive with the US-made "imports" and no longer does that kind of nonsense.
-- Badtux the Car Penguin