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Aug 12, 2021 at 19:49 comment added StephenS @jamesqf Added reference to 91/96; I assume that’s what you meant.
Aug 12, 2021 at 19:48 history edited StephenS CC BY-SA 4.0
Add 91/96, some other cleanup
Aug 11, 2021 at 4:10 comment added jamesqf Re "they ran just fine on 80/87", not always the case. A number of engines required the intermediate grade that used to be produced, with octane rating in the low 90s IIRC). So my Cherokee 180 (Lycoming O-360 engine) has an autogas STC (and runs fine on it), but it has to be premium, not regular.
Aug 11, 2021 at 2:45 history answered StephenS CC BY-SA 4.0