Does anyone know what the difference is between Napa's Mileage Plus wires as opposed to their platinum wires? Will there be any difference in performance/gas mileage? Are Borg Warners any better than NAPA stuff?

I have Borg Warners, and they're pretty good and build strong. I haven't noticed any change in performance/gas mileage from wire change AFAIK. I had the original toyota wires up until 3 years ago. I had to change only because the insulation was looking old. I put Bosch wires in, they lasted about 6 months and fell apart (they're not built strong enough to be pulled off of the plug)... it was a DISASTER!

Basically all I can tell you is I have Borg and Warner and am very happy with them. But do not notice any real performance/mileage change. As far as NAPA, I do not know, so I could not tell you which is better. I have heard in another thread that the Toyota OEM are really good and probably your best bet.