Contour Enthusiasts Group Archives Forums General Troubleshooting Replace spark plugs - best gas mileage?

I want to replace my spark plugs. What are the best replacements for the best gas mileage?

Should I stay with Motorcraft OEM? Or the Autolite Platinum? What's the difference between single and double platinum?

I have a 1999 Ford Contour L4-122 2.0L DOHC SFI.

Thanks!

Mary

Ps. I have 100K miles, what's the best fuel treatment to clean the entire fuel system?