I buy independent station 91 octane gas. And now I put about one ounce of my friend's ("Dynosurge") fuel treatment per tank of gas. [I've used his Dynosurge Metal Treatment on everything from bearing grease to differential oil to transmission oil to engine oil to my lawnmower engine - It seems to work because everything seems to last longer (subjectively, of course)].
It's still working with no rough idle. I was starting to wonder if it would ever go away?
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Jim
1995 Laguna Blue SVX AWD L - 240K (daily driver) -
"ReBuILT" used engine at 236K miles (6/13)
2013 Veloster Red - Driver Now??Dropsprings [1/2" rear, 1" front] with Koni Strut Inserts> Magnaflow Exhaust System>
ECUTune Stage 1av1 Upgrade (from 1v4)>
ECUTune TCU MOD> Aluminum Crankshaft Pulley> Stainless Brake Lines> Phenolic Spacers>
Perforated Brake Rotors (dint like, OEM now)> SmallCar Shift Kit (resting since TCU MOD)> 7-Position Ground System>
High-Pressure Fuel Pressure Regulator (resting)> ATF Cooler & Campaign Filter> Yellow Polish Polyurethane Bushings> Pioneer Double-DIN Stereo with JL AUDIO Speakers>
Driveshaft Rebuilt with C-Clip U-Joints>
15 Min MOD>
20 Min MOD .. . (2011)
Valentine One Radar Detector with Remote Display - ucan'tseeme! 