Hi all, I just wish to know what is the relation between density of a fuel and mileage that it gives??? Simply asking, is petrol(MS) having density 0.760g/ml better than that with density of 0.720 g/ml, all other characteristics being same???

I also tried to get answer for this question, even with societ of automotive association of india. But no answer availed so far. Oil companies say there is no difference milage. the standard density of ms is between 720-760 at 15'C. So if you got any authontic information please do contact.