Did the seafoam spray through the intake last night. Did about half of it in front of the throttle body but didn't like how it would pool up right in front, so I moved over to putting it in through the brake booster line.
The instructions said to have someone hold the RPMs at 2k, but I was solo and didn't have much issue just putting it in at idle. Engine slowed down once or twice, but I just stopped spraying and waited for it to get back up to speed before resuming the application.
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Camera only looks to have captured about half the smoke. I backed out of the driveway and gave the engine a rev and threw some error codes with a hard CEL.
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Cleared the CEL and went for a drive with several high RPM moments. CEL never came back, so hopefully that was only an initial "holy crap" by the ECU.
It felt like it pulled harder after doing it, but time will tell if I see any improvement overall.
MPG has been pretty consistent about 16.8 and doesn't seem to vary much no matter what I do. [i.e. fuel additives, or weight reduction (removal of skids and camper top)].