I get my best mpg using mostly 'D' and doing as much coasting or ev mode as I can. I only use 'S' when the engine cold light is on and I'm accelerating after a traffic light or going up a hill.
The other time I use 'S' is on a long upgrade and forced regen has kicked in after the battery charge level has gone down. I noticed that while on the upgrade by shifting into 'S', and holding the mph steady, the speedometer background light would change from bluish to pure green.
Principles supporting my driving style for even higher EX mpg:
Have the engine operate as little as possible, especially when standing still or moving slowly; while also meeting my demands for power and maneuvering. This means most battery charging while cruising city streets and rural roads, max regen from slowing down and downgrades, and only using heater or A/C when the engine is on for other purposes.
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