What should I put in for spark plugs & wires? Thanks Jameslvey24 for your suggestion, but when should I replace the sparkplugs & wires normally?
I've already changed out:
- motor oil - Royal Purple 10w30. Last vehicle I had it gave me over 4 mpg better. My hopes may be high, but I'm hoping for something similar!
- Supercharger oil
- Transmission oil
- Antifreeze/water for cooling system
I only got 24.94478368mpg @ 75 mph Hwy & very little city driving! 192mi worth total!!!😧
Just a reminder it's a 2004 Pontiac Grand Prix GTP 3.8l Supercharged with 65,245mi.
I plan on putting in my K&N air filter, that I already have, sooner than later too!
I JUST WANT BETTER MPG!!!
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