Veg and additives are said to polarize (turn to plastic) in some ratios but what ratio? have a buddy that lives in northern Montana runs stock fuel tanks, home made fuel line heater, including the tank (hot coolant and copper tubing) stock tank switch, and factory filter head with added heat. starts on diesel switches at the end of his driveway to veg 10+ years, switch's back to diesel five miles from home, parks in a heated garage manual trans has forgot to switch a few times, over the years, plugs it in and ethers it. he can turn off the extra heat and run all #2 on long trips, 1990 7.3 f350 4x4