That's not bad at all man! I read 18.5mpg and was a little shocked because my finny with the stock m180 and the twin 2-barrels gets 19+ on the highway and I thought you'd surpass that for sure. Then I read why- mountain passes, S-curves, huge elevations, heavy winds, I'm sure my car would be way down in the mid teens on that trip. Sounds like you had a blast, it's really amazing that you totally re-engineered the fuel system better than stock in many ways. I'll bet you're right in that the regular tank vapor system might be a little thrown off with the FI pump throwing all that fuel back in there. Were the FI models any different in that regard?

I'd think that with your engine working hard in the mountains all day and pulling most likely ridiculous vacuum on an abnormally long downgrade that a little puff of blue isn't all that bad. Maybe it was just the unusual circumstances.

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1967 230S automatic
Boston, MA