I agree it does not make sense but as atfab noted and hundreds of other users have noted it DOES happen this way. I have a feeling there is a lot more "going on" in our ECU's that is triggering something to cause it to happen. The communites best guess was O2. The reason this seems confirmed is that those who use H2 only seem to not have this problem but then again this is very hard to do so they are not producing much gas probably not enough to actually trigger what is happening in the ECU and also not enough to do anything to mpg.
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