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Corvette C6 versus 911 Porsche maintenance

I have never owned either a Corvette or 911 Porsche.
Before I buy new I have 3 burning questions:
1) What is the interval and cost for oil changes?
2) What is the interval and cost for a major tuneup?
3) Iridium spark plugs better than Platinum and Copper?
I want high gas mileage, long wear with only a minimal performance hit.
Non-turbo with automatic transmission and paddle shifters.
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