I have used almost all of the additives in may cars. I never noticed anything with techron and BG44k, I used twice on my current car. I did get probably the best gas mileage I ever got when I rain bg44k the first time, but the second time I noticed nothing. Regardless of this I still will use techron and Bg44k every once in a while.

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1984 300SD Orient Red/ Palomino
1989 560SEC
2016 Mazda 6 6 speed manual
1995 Ford F-150 reg cab 4.9 5speed manual