03/04 guys using a Viper spec T56?

[01cobravortech]

I was wondering if there were any 03/04 Cobras running with a Viper spec T56. I was curious what you guys were reporting regarding its affect on fuel economy. I genuinely have wondered if that deeper 5th and 6th have had a pronounced effect on fuel economy. Any input would be appreciated.

 

[Fast Willy]

No more then 3mpg just cruising on the highway.