This is a good point.
As for safety what is the difference between having a 10 pounds propane
tank of two (with snifter) on board Vs having 10 - 20 gallons of gasoline.
The safety issue is relevant many diesel owners do carry 5 to 10 gallons of
gasoline for their dinghy gas motors outboard anyway.

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If the A-4 runs, do not replace it. You will never recoup the cost.
Any safety concerns about having a gas engine can be covered by
following proper safety procedures.