gaijin
GOLD Star
I think Bully dog makes tuners for the 5.7. They might know more about the toyota ecu fuel and spark tables in relation to octane.
Well... when I search the Bully Dog site for all products for my 2013 Toyota Land Cruiser with 5.7L V8... only one product shows up - a "Throttle Enhancement Device." It appears they offer nothing involving any kind of engine tuning.
Try it yourself here: Bully Dog Product Search