My carbed VWs run pretty well in the cold, but I figure they're running richer than stoich even when the automatic choke has fully opened.
This thread has gotten me interested in adding a wideband O2 sensor and gauge to my '67 Bug when I start playing around with it again. It's so cherry that I don't want to radically modify it, but it would be interesting to see what the AF ratio is most of the time and maybe play around with rejetting.
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Best tank (so far): 32 MPG
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