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Mid '70s cars and lead gas requirements
I'd appreciate having a few "leaded gas" questions answered.
1. My understanding is that cars went from "soft valves/lead required" to "hard valves/lead or UL okay" to "catalysts installed/UL required." What's the yearly breakdown here? Same for all the big three? Where do I find this out?
2. If I get a leaded car--since you can't buy "regular" these days--I see three options: run UL for as long as possible, buy a lead additive, or use something like 100LL aviation gas.
a. what's cheapest?
b. Is it legal to run 100LL in a car? What would be the penalty if caught?
c. 100LL has 2g lead/gallon. What's the min requuired (i.e. can I "step on it" to save $$$?)
d. 100"octane" avgas calculates octane in a different way and its octane is higher than (R+M)/2 octane. Any ideas what it works out to?
4. I know aircraft that can run auto gas CAN'T run ethanol blends due to rubber in the fuel line that'll deteriorate. Modern cars are equipped for this, but will running ethanol blends in an older car cause rubber bits to clog the carb? (I see the "ethanol" page but didn't want to start a new thread just for this.)