There are definitely pluses and minuses for using wider tyres. Wheel fitment issues aside, there are positive aspects of using wider tyres.
All things being equal, the critics will cite increased tyre weight, higher inertia, rolling mass/resistance, ride comfort, and even change in speedo accuracy....
However, the exact performance is not known for a 225 to 245 increase. Would the 0-100 drop by 0.5 seconds? I think not, though I have no data to prove.
The key benefit of wider tyres is traction, and this should offset any minor setbacks from the negatives, IMO. Straight line and around corners. This requires no explanation. The lesser sidewall flex is another plus, which will increase cornerning ability. Also, wider tyres may decrease braking distances on dry pavement. I think these benefits are undeniably part of "sheer driving pleasure" rather than minimising fuel consumption.