Longer Power Cords Sound better?


In my quest for power cords, i have noticed that a longer cord say 6 or 8 feet tends to have a nicer sound in my system that the same models that are 3 or 4 feet.
Power cords i have found this to be true include Cerious Tech, Cardas, and VH Audio....anyone have an explanation?

AND by nicer sound I mean they tend to have a richer midrange, and a more coherent top to bottom presentation.
ie
Thank you for the constructive remark BOJACK. Are you planning to share somefirst hand experience with us?
I dunno, Bojack could have meant that my little dialectic was hogwash rather than the topic of long power cords, guess I couldn't blame him if he did...

Grant: I have one 1m and a few 1.8m Sidewinders, and although the shorter cord hasn't sounded better to me, as I might have vaguely thought it somehow ought to, I've never done a rigorous comparison to try and find out (in part because recently I've only used the Sidewinders for my tube monoblocks, and figured both amps should get the same length cords). But I might extend the test to the Sidewinders just for yucks, depending on what I observe with my newer 1.5m vs. 2.5m cords.
Zaikesman, you should keep equal-length PC's on your amps. No matter which side of the length argument a person falls on, we're in agreement that length does affect sound. I would think that having unequal-length PC's would affect soundstaging.
I'll confess that I'm just itching to tell you what you can expect from your listening tests, but since that would 'poison' your mind, I'll refrain.
Stop concerning yourself with such nonsense and enjoy your system. No, there is no difference.