Like the saying goes "you get what you pay for! thanks for all your inputs.
My suspicion was just that "a whole lot of bull" as we say here in good old OZ.

It seemed odd to me that when an engine is cold (back in the old days before auto choke and injectors) you would pull on the choke to let more fuel in, so the thing would start and idle.

And so that explains it all, that yes you would get more power and as one said you can get that same power if you just put your foot down a bit more than normal, but as far as economy NOT!

Thanks again everyone and to those unaware of those cheap resistors which claim more horse power and less fuel is BS....DONT GET SUCKED IN, I DIDNT!