Technically I should have voted for kerosene as being most economical. It has more energy in every drop and the cost makes it more economical. Cost comparisons can give different results in other places or times.
But it is harder to light and takes longer to warm up to operating temperatures. I answered unleaded in your poll because it is just easier to work with and I usually fill the bike's 20-litre tank late in the day.
I prefer Primus Omni-lite over the Coleman I had.
I also used plenty of unleaded in a Svea 123 with only mild clogging -- it would clear up after sputtering a bit longer than when burning Coleman fuel.
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