If it is an auto, put it in third gear and drive 70 MPH- the RPMs divided by 1000 will match the gear ratio. So if at 70 MPH you are running at 3150 RPM (±), you have the 3.15 performance gear. If you are running at 2730 RPM, you have the 2.73's. :woowoo:
its not a bad ratio for a stock engine that you don t run hard...my C5 gets over 28mpg with it... if you want more performance [ I have a C3 for that] increase the ratio to 3.42 or 3.73 ...will make it more responsive at low end but will lower mpg
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