I did 300km's in my car on the weekend and noticed everytime I...

I did 300km's in my car on the weekend and noticed everytime I put my foot down there was a hesitation..
I took it to the mechanic and he drove around the block and he found the same thing.
His professional assessment based on the evidence presented to him was there was a hesitation when he put his foot down.

Manufacturer evaluated tests on 590+ subjects and came to a conclusion which they published.
Independent test undertook small sample verification and came to the exact same outcome as the published results.

Moral of the story - My mechanic didn't need to drive 300km's to verify what I had already claimed. His small 'sample' exactly matched what I told him.