Ran my 90 TDI on it for months , i personally wouldnt use any ratio but 50/50 because of said starting probs, engine seems to have more urge and not so rattley BUT check your fuel filter after a couple of weeks- it will have loads of curly bits in it if its a steel tank thats the paint from inside the tank, other than that its all good, now run my Paj on it -
same as,