not adviseable,as it depends on how much the dilution rate is,"ie" how much you have in tank-and how much fuel you are adding, petrol in too great an amount will damage your rubber seals in the diesel pump,very expensive to sort. so NO is the safest bet. buy proper additive, its cheaper in the long run.!
A2. In a part of the country where temperatures go low, your fuel supplier should change grades with the season, and don't be left with too much summer grade in the winter.
The fuel grades go to arbitrarily low temperatures - consider the wing tank temperature of a jet plane.
The fuel doesn't 'freeze' it gels. The problem is in pumping the stuff, not in burning it.
In the Antarctic at Scott Base, we used jet fuel the year round.
[btw. we used kerosene in the coolant system in the old Fergusson petrol tractors. Much cheaper that anti freeze and quite effective.]
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