> I think lead and lead substitutes boosted octane.
Tetraethyl lead is a cheap way to boost octane. But gasoline can be formulated to boost octane without using lead, it's just more expensive.
Newer cars are much more tolerant of low-octane fuels, due to technologies such as knock detection and fuel injection.
It sounds like you've owned a lot of interesting vehicles. Most folks sell their Jags because they get sick of the repair bills, not because they're uncomfortable.
Note that today's octane ratings are exactly comparable to those back in the sixties. Current pump ratings are an average of the Motor and Research octane ratings. Back in the day, I believe they used the Research rating because it is higher than Motor.
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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