Or it could just be that the spark gets drowned more easily at the larger distance.
As it's two different sets of plugs I'm using (Bosch/NGK) I don't think we can directly conclude it's an ignition issue.
If it was spark related, I'd expect to be seeing issues at higher revs/hard acceleration which there just aren't. I also find it hard to imagine that I've got 2 failing coils, especially as they're only 3-4 years old.
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