Here's how I look at it. I just took my 19" off today due to putting winter tires. Looks like I can drive another good 7-8000 miles on the 19" tires. My current mileage is 12000 + 8000 = 20000 miles on the same tires. Lets say I keep the car for 5 years (or about 100K miles). You're looking at few hundreds of dollars difference over 5 tire change, that's it. If you can afford a $35,000 car, these extra few hundreds should not be a problem at all. I just spent $1800 dollars on winter rims. Where does this $ falls into your "calculation"? Most people here spends thousands and thousands on their Z. So, these extra few hundreds are not even a factor for us. Also, the grip on the 19" tires (275/35ZR19) and (245/40ZR19) are def noticeable IMO
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