How about heating oil I've heard someone running their BMW on neat heating oil and they have done for years summer and winter.
its illegal, but it works. add some 2 strroke oil, atf etc. for lubrication, it burns hotter tho. eill fuvk piston rings. dont boot it too much if your using it. ive thinnedcooking oin with it before. ran escort van on it for long enough, used to fill a 45 gal drum then mix it with gear oil and put it strait in, it got to the point that it wouldnt start as compression was low, had to bump it or add a little oil to the intake.
overall, not a good idea tho.