Same issue here but it didn't start until around 5k (first oil change at 3700m). It used to be intermittent with the worst area 3 - 4k. Sometimes it is low power but progressive with a kick and other times it is just a complete dog unless I completely step on the throttle and get it to at least 6k or something. With the AC on the just seems like no power at any RPM. The high heat in the NE right now has definitely made it worse. I stay with Shell first and Exxon as my second choice. I'll try the battery disconnect tomorrow.
Robert
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