OnebaddRx8

What PCM flash is yielding the best overall gas mileage and performance fior the 2004 auto. From what I've read I currently have the L flash now.
Thanks

OnebaddRx8

No one can tell me? I know not everyone has the same flash in their Pcm.

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niteshade247

I think your missing the point of factory flashes they are not different flashes for different performance and MPG they are for issues that mazda has fixed. The best flash is the most up to data flash none other.