Diesel..

You may not be able to purchase gas, and storing it is dicy..

But get a diesel started, and you can burn Diesel, Jet-A, Kerosene, vegetable oil, etc..

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Agnes (the Limo) '84 300SD
Pearl (the Taxi) '81 240D (preparing for the 'afterlife')
Bridgette (baby girl) '82 VW Pickup-- currently getting readied for her rebuilt (overbored) engine.
1 VW 1.6 NA diesel **not installed in vehicle**
Gidget (the bimbo) '87 VW Cabriolet-- the diesel engine it above is eventually going there!

and a BMW Motorcycle. (1998 R1200C)

Did I mention I'm of German Heritage??