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Old Apr 23, 2005 | 09:50 AM
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Default Performance axle

What is the difference in mpg between the stock gear ratios and the performance axle in an automatic C6?
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Old Apr 23, 2005 | 01:19 PM
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not enough to concern yourself...
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Old Apr 23, 2005 | 01:30 PM
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I agree , and most gas milage is a variable to your driving style...
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Old Apr 23, 2005 | 01:32 PM
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Originally Posted by HPVA
What is the difference in mpg between the stock gear ratios and the performance axle in an automatic C6?
I'm getting the claimed 28 MPG highway with the 3.15 rear axle. I haven't heard anyone claim better MPG. So if the 3.15 hurts mileage, it certainly isn't by enough to be noticeable. How you drive affects mileage more.
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Old Apr 23, 2005 | 05:29 PM
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Getting 18 MPH in Southern Ca traffic with 3.15 - Unless you plan on doing a LOT of miles on the car it shouldnt be a sig. factor in your choice
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Old Apr 23, 2005 | 05:33 PM
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Originally Posted by Mocoso
Getting 18 MPH in Southern Ca traffic with 3.15 - Unless you plan on doing a LOT of miles on the car it shouldnt be a sig. factor in your choice

Echo above, 18 mpg in So Cal area with 3.15 auto
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Old Apr 23, 2005 | 05:34 PM
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Averaging 20.70 mpg overall after 2750 miles, with 25%-30% in town and 70%-75% at 40-55 mph.
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Old Apr 23, 2005 | 10:42 PM
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20.1 with auto and 3.15. EXACTLY the same as my C5 with an auto and 3.15. with the exact same type of driving.
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Old Apr 23, 2005 | 10:45 PM
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25 mpg with auto and 3:15
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