@jimaco: They are tad nosier than OEMs. Measured on the same highway stretch at the same speed with a dBmeter app on a cell, within 1dB (as innacurate as this is, it does offer somewhat of a comparison metric). One feature that I noticed is that the worse (grooved or old or in the process of being re-surfaced) the asphalt is, the worse the noise increase with respect to the Geolandars. When driving on a new silky baby-butt smooth new road, there is no tread noise whatsoever.
Gas mileage - comparing to my 2019 fuel records, which I've had on stock tires, I would roughly estimate a <0.5l/100 km or 2mpg hit.
Winter traction - no idea. I swapped them for Nokian R5s before the first snow. The Wildpeaks are "snowflake" rated, and will definitely be better than OEM Geolandars, but they're far from being a winter tire. As a side note, there is increasing evidence, and discussion in Canada, that this rating (self-awared by the industry with little to no oversight) isn't much of a guarantee of good winter performance. It only tests
braking in light snow acceleration on packed snow - no requirements w.r.t handling, cold weather grip, latereral grip, ice traction, slush evacuation, etc. So much that the EU is introducing an "ice grip" symbol, and putting mandatory universal performance metrics on their labels (which already include, for example, the noise levels in dB).
That having been said, YMMV. For those seeing occasional slush and light snow, IMHO the Wildpeaks will be sufficient heaps better than stock tyres. For those shoveling 6 months a year, nothing beats a true winter tire.
PS: My Wildpeaks are in 215/65R17. 5mm taller, speedo right on, 5 mm narrower.
Edited. Thanks
@AM407