My 1992 Civic CX hatchback doesn't have lean burn technology, it has the Honda 16 valve ICE from that period.

Exel, I notice that the four cars you list are having DWL experience with are either manual with lean burn (Insight) or are automatic without lean burn (Corolla, MDX, and presumably also the Buick Le Sabre), but no manual without lean burn cars were included (which is what my Civic is).

What I am wondering is whether the "boost and coast" technique I use in hilly and urban driving provides a similar amount of gas savings as DWL and that is why I didn't seeing any MPG improvement when I switched over to DWL.