Lycoming Service Instruction 1070Q
Thanks for posting the link. The doc referenced Lycoming Service Instruction 1070P. I'd not seen this before. It's been superceded relatively recently (16th July 2010) by SI 1070Q.
Here's a link to 1070Q:
http://www.lycoming.textron.com/support/publications/service-instructions/pdfs/SI1070Q.pdf
SI 1070Q lists Lycoming engines and the fuels approved for use in them.
I do not fully understand yet everything the SI is talking about. I'll need to study some more. It does contain some useful background info.
There is a short table towards the end of the document listing Lycoming engines approved for use with automotive fuel of AKI 93, where AKI is the average of RON & MON (read the doc for definitions).
I was interested to see that no (I)O-320 engines are in the 'approved for use of automative fuel' list but there are some (I)O-360's.
The (I)O-360 list includes:
O360 series A, C, F, G & J engines
IO360 B1B, B1E, B1F, B1G6, B2E, L2A, M1A, M1B
Anyway, I think SI 1070Q is worth knowing about.