[MetroMPG]

Hmmm, that switch... Have you got MIMA? More likely it's the brake switch mod which lets you call up max. regen while coasting without actually touching the brakes.

If you like autostop, you will LOVE the manual kill switch for "forced" autostop (A.K.A. the Calpod mod, if I recall). That alone is worth a measurable boost in fuel economy if well used.