I keep a gallon of Wesson Oil in my trunk for the emergencies that may come up.
In the summer I run veggie oil all the time so this is a good option. It's not flammable
and won't stink if it spills. It's the safest alternative for fuel emergencies and will lubricate your engine something wonderful! And found at pretty much every store you might come across.

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Ginny in Denver-ish
78 300SD, 265K (mine)