I'm asking about ground operations.
I'm thinking campaign play as well as construction. TechManual gives Industrial Mechs a range of 450 km to 600 km or 15,000 to 20,000 Walking MP. I can extend that range by adding Extended Fuel Tanks for 10% of the engine weight rounded up.
What I'd like to know is, can Lower tech Battlemechs, and combat vehicles using the same engines also extend their range? If so, how do they do it? The Extended Fuel Tanks are only allowed to by mounted in IndustrialMechs. Or can low tech Battlemechs and combat vehicles use them since under Fuel Cell Engines in Tactical Operations it says they follow the same rules as IndustrialMechs? Would that also apply to Internal Combustion Engines?