Since I drive mostly city miles I've gotten around 13.5 mpg in my '11 M3. I averaged 14.0 over the life of my '09 C63.
I replaced the rear tires on the C63 every 6K miles. They would hit the wear bars there and with living in a rainy area it just wasn't safe to keep using them.
The rear tires on my '11 M3 are at 6600 miles and I'm shocked at the amount of tread I have left. I'm hoping for 12K miles out of them.
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