Query Approved

The answer is very Subjective.
A general thinking about Alloy wheels is that because it 1s made up of Aluminium and Magnesium, it is lighter then the traditional spoke wheel. so that ways it helps in reducing the unsprung weight and also improving mileage to some extent. But I have seen that Spoke wheels and alloy wheels don't have too much of weight difference on the whole,(and am talking about the regular contemporary Bikes and their wheels.) However if Mileage is the only criteria, then I would say..... don't change the profile of the tires too.