when the ash started falling, he had to stop very frequently (every 2 minutes or every 2 miles, I forget which), take the cover off the air filter, remove the filter and beat it mostly free of ash.
I would think that doubling the filter area would have no other effect than doubling that time / distance - every 4th mile or 4th mile. No doubt a big improvement, but perhaps not the one you were hoping for.
I can try to poke around and see if I can hunt down some Icelanders and ask them. They're off season right now, but let's see who I can find.
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