or to put the spin on it that FTT did - "the trial results...

or to put the spin on it that FTT did - "the trial results indicate that adding special formula to plain petrol did not demonstrate that the formula made any improvement to motoring performance beyond that of using plain petrol. This is not, saying of course that the special formula failed. Rather, it means that there was simply no discernible improvement beyond use of plain petrol."
Or in old-fashioned plain speak - it didnt f'n work whatso f'n ever