This is from an article in March 1994 AOPA Pilot
on Braly's after market STC turbo Bonanza with standard 
compression ratio. 

The turbo kit alone was $33,900 for the Bonanza.
You can buy a lot of fuel for $33,900.
  
A turbo normalized  Cont. IO 550 is 300 HP max.

Gasoline weighs 6.152 pound per gallon.

% Pow HP    gal/hr lb/hr  BSFC
100   300   25     153.8  .512 50 deg rich of peak 
75    225   17     104.6  .465 50 deg rich of peak
65    195   13      80.0  .410 leaned to peak EGT which is not allowed.
55    165   10.9    67.1  .406 leaned to peak EGT which is not allowed.                        

A vague promise of less gal/hr was given for 55% power leaned less than peak.

Note: small changes in fuel density and accuracy of the flow meter
can make large differences gal/hr and consequently in BSFC.
 
Paul Lamar
 
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