My (value line) G01 is good at 8x (almost equal to 4x burn) but start to struggle at 12x. I mean, it is absolutely acceptable, just not as good as you expect from the name "TY" above 12x.
So I ended up burning them at 8x. I used T9 firmware G02 strategy. Now U9 and V9 are available for overspeed, but I haven't tried them yet for G01.