Wrestle the tank onto an end by tipping it slide it into your pick up truck.
The used oil tanks are not a great find, the tanks are not always full you may only get 10 or 15 gallons perhaps even less if your not using heating oil at home you have to find an alternative to dealing with the waste. No one is going to buy such a small amount.
If your lucky to find a full tank your in for a good payday, on most heating conversions where the tank was near full and the oil was fresh the oil company would come and pump out the tank for the customer.
Heating and old diesel oil becomes waxy and has to be run through a filter capable of rejuvenating the oil, large fishing vessels that have been laid up for long periods will call in a company that specializes in polishing the fuel, removing the wax.
With these newer diesel that have electronic injectors there's not a hope in hades that I would even attempt using a 50/50 mix of new and old fuel.
Some info here on polishing duel oil,
Diesel Fuel Polishing
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