[19bonestock88]

In theory yes, but in practice, no. Reason being is the weight will require more energy to move uphill, and returns more energy going downhill. If the down grade is steep enough you’ll finding yourself using the friction brakes, turning all that “free” energy into heat and brake dust... best pot case is a grade gentle enough to allow you to DFCO down the other side and have the engine hold you back using no fuel... you’re still gonna have to brake at some point though...