[RiderofBikes]

Idk about you guys, but the talk about tyres is completely moot... As the "average person" buys tires that are cheapest and are usually not taken care of properly in the long run, result in premature wear or failure. WE, as in Eco nuts, do however take pride in our maintenence and upkeep.

Personally I choose not to rotate my tires, while the result of uneven wear accures, I also keep my tires evenly pressurised and aligned properly to prevent further wear.
My fronts as noted by other operators of their own vehicls wear faster(obviously) especially in FWD configurations. They are the ones that suffer the most abuse across their life span. Turning(wheel scrub), hard accelerations, braking, and higher friction by the vehicle unequal weight distribution. The rear of a RWD car can also have a similar outcome as bikes do, dew to the torque wearing down the tread faster from acceleration alone.

My OEM Kumho, since driving off the lot(15mi) now have roughly 35700mi, and the tread depth is still 7/32 frontleft, and 8/32 front right. While my rears are still ~27/32. I can Rotate/Balance along with an alignment be able to rack up another ~22,000mi with the better wheels up front. Then, I will NEED to replace my entire set of tyres. I have also acheived more than 40kmi+ with crappy Douglas tires on a boat of a car(becasue i didn't drive like an idiot). I used them within their manufactured capabilities.

I have also owned many bikes, Touring tires can and will go for a least 15-20kmi easy for most larger bikes. Some more $$$ can last for 40k. Even the cheapest tires for me have lasted no less than 10k mi before compromised handling in wet and aggresive riding occur... Even sticky bald race take-offs can last another 3-4k(summer use) for a marginal $20-40 per tire.

While bikes go through more routine maintenence, they also use(dependant of size) 1/2 the amount of engine oil, during a 2-4kmi period. use 2/3 less fuel or more(less?), go threw a given season of more tires(but equal to resources used to make common set of car tyres). Depending on Bike campared to Car, will cost less to insure.

I see it, regardless of Emissions, both are equal to a degree, pending your Practical Needs and how You take either vehicle and Incorporate it in your day-to-day life. Most have both to accomodate their needs... To each their own