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I haven't seen that but I've only been to a dealer once since January (well 3 times, once to get my new truck, a couple weeks later to pick up the license plates and a couple weeks after that to pick up some accessories I'd ordered). I didn't look at Mustangs, where I'd think that sign might be appropriate.
I once heard that new cars are equipped with tires whose chief virtue is very quiet road noise, in order to make the new car seem appealing on the test drive. But in order to achieve the quiet ride, they have a very poor tread design for traction and the rubber is too soft to endure many miles. Which is why so many tire dealers have complete sets of "used" tires that have been taken off brand new cars by buyers who want to replace them immediately.
Location: East of Seattle since 1992, 615' Elevation, Zone 8b - originally from SF Bay Area
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They have yet to develop a high performance tire that lasts a long time, most tires are a compromise between performance and longevity to meet the consumer's desire. For some that choose these tires, better to replace every 20-30,000 miles and have a more comfortable, safer ride.
I once heard that new cars are equipped with tires whose chief virtue is very quiet road noise, in order to make the new car seem appealing on the test drive.
In addition and more importantly, OEM tires are designed to give better gas mileage. Chiefly done by having a shallower tread depth and a slightly smaller diameter that the same model tire you would buy, from say, the Tire Rack. Thus the shorter tread life.
A lot of buyers have no idea that the high performance summer tires on their new car won't make it to 20K miles. Lots of these buyers are status oriented, who buy their BMW or M-B or Lexus for the image. So those stickers are just warning them about the tire life - so they don't ***** and moan 18 months later complaining about tire life and a $1000+ tire replacement.
Sticky tires just can't last as long. The rubber compound is softer so the rubber conforms to minute surface texture, improving grip. Longer wearing tires are harder, which grip less. (all else being equal).
My Michelin tires wouldn't last a quarter of that number ...
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