Many (over 60) years ago when I was a kid, our neighbor had this "funny sounding" car with a name I had never seen (Mercedes Benz) and in dead of winter it could be heard out there running all night. (it was a little Benz 190D). He had a fuel tank on the side of the garage. He was getting heating oil delivered to his home but did not have a oil heater. But, to "fool" the tax people as he said he ran a small line into the garage where it was basically just for show. He said there was no road tax on heating fuel so IIRC he was paying less than $.10 gal.
He said heating oil and diesel were the same thing minus road tax. He never had an issue.
He said heating oil and diesel were the same thing minus road tax. He never had an issue.