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i think it gets down to risk tolerance. ultimately, you can't tune part throttle because the car is already running at optimum efficiency (14.7:1 AFR). you could lean-out wot a bit (stock tune runs at what, 12 to 12.5?) to get more power and better fuel efficiency, but at what risk to the engine given the reduced quenching? with the current fuel efficiency regs, if the manufacturers could safely tune for better efficiency they would. you could raise redline to increase peak hp and reduce shifting, but again, at what risk to valvetrain given hydraulic lifters? otherwise, there is some room to play with timing, but my understanding is that there is not much leeway allowed with current bosch oem ecus.
if you want to play with wot afrs, get a wideband and a piggyback and have some fun. i thought about it, but didn't have the nads to run my car the track with a 13:1 afr.
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