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Don't use AvGas. Besides the lead inssue, LL or not, there is the mentioned density problem. More troublesome is the additives in AvGas.
Due to the lead content (even in 100LL form), a bromine compound is added to the mixture to scavenge lead residue from the engine. When the lead/bromine compound is burned there will be a small amount that remains in the engine. Lead bromide, when mixed with water, metals, and oil, will produce a corrosive liquid. That is why aviation oil is different from auto oil.
So, go ahead and use it but you better expect problems down the road.
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