So I recently learned about the bi-elliptic maneuver, which is an alternative to the hohmann transfer that involves raising your apoapsis to a much higher orbit, raising your periapsis to the target periapsis at your apoapsis, and lowering your apoapsis to the target apoapsis. It's apparently more efficient than hohmann for target orbits much higher than yours. However, I tested the method by going from a 30km earth orbit to 10km moon orbit, but I didn't see said dv savings. How would I properly use it? Is the reason the maneuver was less efficient because of gravity losses? If so, can I use the bi-elliptic orbit to get more speed for lunar gravity assists?