Referring to the "Big Mixture Pull (BMP)", sharing some recent numbers....

Leaning at RPM 2500  MAP 31.5

50*LOP 19.8 GPH

100*LOP 18.8 GPH

Leaning at RPM 2500  MAP 29"

50*LOP 18.0 GPH

100*LOP 16.7 GPH

Leaning at RPM 2500  MAP 25"

50*LOP 15.8 GPH

100*LOP 14.5 GPH

Engine operated smoothly to 150*LOP and a bit beyond.

Note the EGTs peak at the same mixture and stay fairly consistently together throughout the leaning test.  These are the TCM injectors ala GAMI (I'm told).

Looking at 100*LOP in cruise:

MAP 31.5"    18.8 GPH    214 KIAS   11.38 miles per gallon

MAP 29"       16.7 GPH    186 KIAS   11.14 miles per gallon

MAP 25"        14.5 GPH    186 KIAS   12.83 miles per gallon