Don't know how that is even possible I have a 6-71 supercharger with twin 675cfm demon Carburetors on my Vette and I get around 7mpg if I drove it on the street and that is with a 3.90 rear and a 3 speed th-400.
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2012 Chevrolet Traverse *active*
2002 Oldsmobile Alero GLS *active*
2002 S10 2wd p/u 139,000mi. *active*
1975 Corvette Stingray *active*
1994 Camaro Z28 Convertible 149k *Sold 2013*
1998 Blazer ZR2 189k *Sold 2012*
1995 Tahoe LT 250k *Sold 2011*
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