my dad was telling me about some people he knows here in town who are mixing their tanks, they will put half of it E85 and half of it just normal unleaded, and this is for pickups that are just normal pickups. Not made for E85. So if E85 is 85 % Ethanol and 15% unleaded, then the tank after it is all said and done should be about 45% ethonal and 55 unleaded right? would this hurt my motor if I did this? 350, 650 edlebrock carb, RV cam anyone ever heard of this?