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Nevyn · 06-17-2010, 01:08 PM

Platinum +4's are kind of a waste. The +2's made noticeable effect in my '97 Escort though. I'd say if your plugs are that bad, new ones will probably bring a 5-7% increase.

06-17-2010, 01:08 PM	#2 (permalink)
Nevyn Master EcoModder Join Date: Nov 2008 Location: 18603, USA Posts: 759 The Crimson Crawler - '04 Hyundai Elantra GLS 90 day: 36.71 mpg (US) Thanks: 221 Thanked 60 Times in 45 Posts	Platinum +4's are kind of a waste. The +2's made noticeable effect in my '97 Escort though. I'd say if your plugs are that bad, new ones will probably bring a 5-7% increase.