Back in the old days - WWII, the military was using alky in reciprocating A/C power plants. The military was in the habit of using a dual octane rating on A/C fuels.
A few I can recall were 100/130 & 115/145. The 2 different ratings were without & with alky. I'm aware of the military using a sofisticated method of utilizing the alky, but I see a difference of 30 octane points between without & with alky.
I'm aware of the many different alky setups for the TR & some of them are very well engineered, so I see a possibility of up to a 30 point difference in octane rarings.
I don't know all the reasons as to why alky can make up to a 30 point difference in octane ratings, but I know the military was able to rate A/C fuel with this much difference.
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87T, Baer 12", VR4, Hydroboost, KB cold air, HRP & S lowers, Cibie lights, hotwire, Walbro, digitails
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