I've used Techron. It makes a small difference. Make sure you change your oil after a fill-up or two.
Also, just curious - are your spark plugs original? If so, change 'em. It makes a very big difference.
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SOLD - 2002 Boxster S - PSM, Litronics, De-ambered, Bird Bike Rack, Hardtop, RMS leak...
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