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While I understand your goal I can not suggest a higher ratio, as the engine is lugging while in overdrive at 60-65 mph with the current ratio of 3.73.
No matter what you will not get the mileage of the Vette as the weight has more to do with it then the rear ratio.
Take into consideration the rear tire height of the SSR compared to the Vette and then work out the gear ratios and you are already there.
I think by changing to a higher ratio gear set you will actually decrease the mileage.
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'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger
Authorized MagnaCharger Dealer/Distributor
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