When my MPG's went down the Toilet , I tried every Driving-Technique known to BOTH Man , ... and GOD !
After several years, I (mysteriously !!!) started playing with the Paddle-Shifters, and SUDDENLY my HB25i went from its 25-26-MPG problem , to 30-31-MPG on the Open Road .... ! Not sure exactly why , but after that the "D" Mode also was delivering 30-MPG in the Upper Gears, so I suspect the TCC-Solenoid had been stuck for quite a while ... !!!! ; and somehow the Paddle_Shifters, combined with "M" Mode had apparently done a KITA ... !
Just recounting an actual event, obviously involving the "M"-Mode Paddle-Shifters .... !
I am back to using the "D"-Mode, but if I ever again suspect Poor-MPG's ... my first move will be .... Drive In Manual Mode for a short time ..... !!!