[MetroMPG]

1) Put an engine kill switch in it (expand the auto-stop envelope). AKA "Calpod mod / Forced Auto Stop / FAS mod" at Insight Central.

2) Put the IMA-inhibit switch in it (so you can control when you want assist or not). AKA "clutch switch mod".

3) Learn how to keep it in maximum lean burn as much as possible while cruising. That's where the magic happens.

4) Pump up the tires & aeromod it to expand the lean burn envelope.