My first comment would be you can't work with just one % without addressing manual or auto tranny. An automatic is going to eat up much more power than a manual.
There is no magic number I completely agree, but I have always operated under the range of 12-18% loss for manual and 20-25% for automatics.
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2004 NASA AIX Mustang LS2 #14
1964 Lincoln Continental
2014 4 tap Keezer
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