Don't think that there would be many that would argue that a turbo is the most eficient of the 3 types of forced induction. But a good ? is what turbo setup is most efficient?
I have always found the tailpipe turbo STS style is the best route for effiencey and installation  No need for a intercooler when it is where the muffler is located. It keeps engine temps down and cools the charge in the longer travel distance back to the intake. I know someone with this setup but he is tuned for power not mpg
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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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