Originally Posted by Axxe
Leaned out + optimized fuel curves + tweaked timing = better fuel economy. More power with less throttle = better fuel economy. Not exactly surprising....
It's not really leaned out. The part throttle maps are running a bit more fuel but with the more advanced ignition timing, the motor is using the fuel more efficiently.
I thing that presquile can get even better mileage, as he had some O2 sensor related errors when he came over.