[MetroMPG]

Interesting idea...

I wonder if one reason it's not done already (aside from cost/packaging) is because the latest CVT ratios are now so wide, the fixed gearset would have to be especially tall which would limit the amount of time it actually spent engaged.

It would probably be so limited that the impact on the EPA test would be minor, and there wouldn't be an incentive to manufacture.

...Even if, in the hands of an attentive driver, it would return a decent boost in MPG.