I really hate to own up to this , but what the heck. Once in the '80's I put about 3/4 of a tank of diesel in my Cuda and was 3 hours from home. After the gas in the line was spent boy did she smoke. White smoke like nobodies business especially during acceleration and decceleration. Got home, tore down the top end thinking intake gaskets and anti-freeze getting in the cylinders. Put it back together and still smoked. Drove it like that until it needed gas again then it finally went away and no harm to the engine. I remember being really hung over at the pumps, that's probably why the mistake was made. Thank God those days are behind me.