One gallon of Propane weighs 4.2 pounds. 250 gallons of Propane would weigh 1050 pounds. You wouldn't get very far with only 250 pounds.
A friend of mine has a 100KW propane powered generator with a V-10 ford motor. I think he said he could go for three days on 1000 gallons.
A friend of mine has a 100KW propane powered generator with a V-10 ford motor. I think he said he could go for three days on 1000 gallons.