[nbleak21]

This is done quite a bit in the tuner world, especially those who are tuning under boost and e85... typically they run chipped ECU's or complete FMU's so it's a lot easier to manage ignition timing.

That being said, those who don't have that option (due to emissions testing, budget, etc.) often "trick" the stock ECU in order to gain a few extra degrees of timing... myself included (emissions testing here requires OBD2 port plug in, so I can only run a piggyback)

If you're looking for that few degrees timing, the most common way is to retard the base timing, generally around 4 degrees from stock then reset the ecu (disconnect battery, turn ignition on, press brake pedal 10 times, let sit for a few min, works on most vehicles) and allow the ECU base-map to establish itself (usually around 100mi) and then set the timing to factory specs.

This will give you up to a 4 degree (ECU controlled) increase in timing throughout your load range without exceeding the max OEM timing advance... not sure what it is on your Toyota, but on my Acura it's around 45 degrees.