> 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 - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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