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If you go the route of alternative fuel, the first thing to worry about is filtration. You don't want gunk and particles getting pumped through your injection system. Next is viscosity: if you get the blend too thick, you'll stress your seals, underfuel, and risk cavitation in the IP. Kerosene is a common "cutter" but I just use #2 diesel.
In an IDI you can run about a 50:50 blend of clean wmo and diesel, with no modifications. I don't have any experience with veggy oil.
The only time I have had trouble with WMO is when I was making a bunch of short trips that barely got the engine warm. The injectors had plenty of of carbon caked on the tips, hurting atomization.
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