Does the SR have adaptive shift mode or whatever it's called? That's the transmission, anyway, not the
ECU.
The main reason I do an
ECU reset is to stop the car shuddering at idle and high load (eg in reverse at 0% accel, with rear demister and headlights on, then the A/C compressor kicks in and the whole thing shudders like it's about to stall). Over time, several months, the
ECU seems to "forget" and the shuddering gradually creeps back in, so I reset it again. I've never noticed any change in fuel economy.