It's hard to say without knowing drivetrain losses. I don't think 12% loss is way off the mark for a manual trans in a FWD car.
'12 SE Sport 5Dr |╠╬╝|Sterling Grey Metallic|203a|Moonroof|17" Mach/Paint Whls|K&N Typhoon|MS3 RMM|Steeda STB, RSB
'01 ZX3|╠╬╝|Pitch Black|Prem. pkg.|Moonroof|SVT Snorkel|SVT Springs|S2 Dampers|Steeda STS|Magnaflow exh.