Managing EGR for MPG

[MetroMPG]

Originally Posted by DRW

I was thinking about using a small oil cooler, maybe a two row power steering oil cooler. I'll see what I can find in the junkyard tomorow.

Would a cooler cause water vapor to condense out of the exhaust? If so, would you have to have a way to periodically drain it?

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Noticed another point in the VX article linked in that supports the EGR mod idea, but for a reason not yet raised in this thread:

Honda modified the VX to use exhaust gas recirculation (EGR) instead of excess air to dilute a stoichiometric air/fuel ratio. Using EGR, exhaust gases are recirculated into the combustion chamber to
reduce NOx emissions by lowering combustion temperature. EGR also improves fuel economy by using energy from the waste stream. However, lean burn is more efficient than EGR.

Now that i've got datalogging capability I'll also have to look to see whether EGR control is one of the parameters I can monitor. (I know it's in the list of parameters in the software, but the car doesn't necessarily have all the sensors the software can monitor.)