Sure I want to modify it. The engine management software is desperately afraid of stalling, and it's built to endure things like 10W30. I want my ECU to live on the edge a little.
This chart, from a paper by Subaru, shows my engine's BSFC (in grams of gas per horsepower-hour), which is what I need to minimize to get the most oomph out of a gallon. The chart leads to two conclusions: revs bad, using the engine near its capacity at a given RPM good. The latter is achieved with throttle.
I know the above plot represents what the engine is capable of. What I'm not sure of, is whether their test used the same ECU I have. Oh, if I only had a dyno and a laptop-based OBDII data acquisition setup.