Yeah, I’ve done the math. A Hohmann swing is usually cheaper when the destination is close and the delta‑v budget is tight – it’s a single burn out and a single burn back, so the propellant count stays low. A bi‑elliptic is a three‑burn trick that can beat the Hohmann only when the target planet is far out, like Mars or beyond, and you’re willing to spend extra time and a big burn at periapsis to raise the apogee. In practice, the extra propellant needed for the middle burn usually outweighs the gain, so I only recommend bi‑elliptic for very specific cases where fuel savings are marginal but time isn’t critical.