This sounds similar to a problem I just had on a roadtrip a couple of weeks ago. I think the oxygenated fuel was plugging up the lines or filter. It would start acting very poorly and really down on power about 50 miles after fill up in a station along the highway. I topped of the tank with Texaco 93 octane and it ran fine, until the next fillup with oxygenated fuel.
This was in a late model M*****G but sounds similar to your problems.
hope that helps.
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