SMURFF: Simple Module adjUstments for Real-ish Fuel-mass Fractions For people who want real-ish fuel mass fractions without too much hassle. Formerly "Simple Mass adjUstments for Real-ish Fuel-mass Fractions." Features SMURFF is a Module Manager patch that reduces the dry masses of fuel tanks and engines and improves engine performance so that KSP rockets can have fuel mass fractions closer to what we make in the real world, without going into per-part configurations like e.g