I think it's a bad idea, using something that was only meant for 50 miles/ 50 MPH is highly likely to cause some problems which could be quite serious in the case of wheels.
CapriRacer that data (like most) fails to take the increased weight and accompanying inertial loads of the larger tires into account. I suspect for small changes it probably about evens out but I'm sure for larger changes it would be detrimental. Most of the rednecks and gangster wannabees where I live tend to go for the extremes if given the chance.
I think it would be more correct to say wider tires are better for rolling resistance, and they MIGHT be better for FE, depending on other factors.
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