My current '08 Boxster and previous '08 CTS. I ran the numbers against the Boxster, but the CTS payment was nearly identical, and it got similar mileage. The CTS maintenance cost was bit lower though...
I included loan payments, fuel cost, maintenance, and annual registration. I didn't include insurance -- but I don't think it will change significantly (the Boxster is slightly less than the CTS to insure)
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ZBB
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