[Thebigzeus]

IMO Trifecta is the best option. Even though when I contacted them they had very little interest in making a MPG based tune. But the times are a changing.

How are they the best option if they don't want to provide an Economy tune? lol... @[email protected] from BNR gladly made one for me, keeps the car out of boost and increases mileage a ton.

 

[Thebigzeus]

OE plugs are the best but might benefit from a slightly tighter gap.
Why would you use 'ruthenium' when the GM spec calls for Iridium ?

For the reasons listed here:

Ruthenium HX™ Spark Plugs - NGK Spark Plugs

Ruthenium HX™ spark plugs for NGK are designed for maximum durability and performance in today’s highly efficient engines.

ngksparkplugs.com

 

[Thebigzeus]

Well considering they're the only ones who make them...