I've found some stations around LA, have just a crappier gas.

I try to use Chevron mostly.

My car had some weird problems, and I filled up at a station and they went away.

Filled up at another and they came back.

I would run some injector cleaner through your engine, and see if that helps out.

But I like the oxygenated theory you have, sounds like it could possibly be an answer. I am interested in finding this out too.

Alon

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'92 300CE - Sold
2004 C240 - 744 - C7 Wheels - Android Radio
2002 C320 - 816 - Sport Wagon - Sold
2006 E350 Wagon - 368 - Dead
2015 GL350 Bluetec - 197U