[Christ]

I don't think EGR reduces pumping losses, because you've already pumped the exhaust out, and you're sucking in the EGR's recirculated gasses through the intake, just the same as you would be normally. It's a nice thought, I just don't feel like it's going to work that way.

Even if it did, it would be approximately in line with opening the throttle with the engine off and using the compression for braking. The difference isn't there on all vehicles, and even if it is, it's only a few feet one way or the other.