I've been running a ~30% mix of soybean oil in my '79, and it's been
starting up every morning even with frost in the air and on the glass. I
get the oil from Costco for about $13 for the 35# (~4.6 gallon) jug, and
pour it in right before filling up at the pump, and I usually fill when
I'm at 1/4 tank. Mind, if you go this route you'll need to change your
fuel filters a couple times in the near-term.
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