Toyota cites the example of pulling up at a red light, but AGC also saves fuel on gentle inclines. (motoring.com.au)
The fixed gentle incline provides added resistance to help build muscle, but won't strain your joints. (geekwrapped.com)
The point remains however, that the overall trend for the past 300 years seems to be a relatively gentle incline and that this trend line will need a lot to shift it markedly in the next decade or so. (judithcurry.com)