NGK spark plugs wire and fuel

[Seb_]

Hi;
since few months I run with those NGK spark plugs wires :

Bought in Japan by a friend, but since my fuel consumption (mainly 10 min city driving) has really leveled up.
I'm thinking about putting back the black Nissan stock ones.
Does some of you run with the same spark wires and experienced the same problem?
Cheers

Seb

 

[Shaun]

so does this mean your getting fuel burned quicker isnt that a good thing all be it a sacrafice