I have run up to 20% Tiki Torch Fuel (tinted kerosene) obtained free from the re-use table at county's Hazardous Waste disposal/re-use facility. I add 2-cycle oil (also free) at 50:1 and Power Service Silver cetane improver. This runs fine in my 40yo Yanmars. Can smell like an outboard motor.
Yeah I'm cheap. I also believe in re-use of anything legal to sell, in preference to the county sending those jugs to be buried in the desert.
Come to think of it, long ago I bought a few gallon jugs of kerosene heater fuel, discounted to $1 at Home Depot in a seasonal closeout. Also run with 2-cycle oil and Power Service Silver.
No problems noted.
But I think these 70's designed Yanmars were made to run on whatever fuel was available in remote areas. The manual says when there is more than a tablespoon of debris or water per gallon of fuel then change the filter element more often, as needed. I can't imagine commercial fuel that bad.