IMHO Capri Racer's advice to go wide makes sense if you are loading the tires to near max capacity. I would expect a tire engineer- who is always concerned with liability issues- to have that position.
However I think if your vehicle is always at the lightly loaded end of the spectrum, fe gains can be had from going narrower, to tires with fewer plies and thinner sidewalls and treads. I have yet to personally test that theory.
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