I changed my spark plugs with NGK Vpowers. Paid about 8.00 for them.

After I put them in I noticed bad gas milage, what could be the problem? I'm at 200 miles at a quarter tank.

 

are those the ones with dual electrodes?

 

oem NGK Coppers.....F's only like single electrode...

 

Just installed NGK Irridium IX plugs yesterday...$32 for the set at Advance Auto Parts,so far I like them....trying to get better MPG since I drive 50 miles/day to work.

 

they wont do anything......having 4 electrodes is just dumb.....theres a good article on spark plugs in last months issue of GRM

 

No,these dont have the four electrodes...the tips are irridium which is supposed to be more durable than platinum and copper and they're supposed the give a couple more hp.I haven't noticed much difference though.
Glenn

 

Are you sure you are not just trying out your new added HP and getting really bad gas milage, you have to compare apples to apples, you are going to have to drive like grandma to get an accurate milage test done, just drive 500 miles on the highway tonight and see what you get, oh and by the way, stick to the speed limit too. Good luck. Iridium tips only last longer, different heat ranges gives the extra HP as does different types of plugs, all debatable.

Duane in Japan

 

what heat range... is it a hotter replacement plug you put in?

 

I have Denso Iridiums and I love them, totally worth the $40.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muffler Bearing &raquo;</TD></TR><TR><TD CLASS="quote">I have Denso Iridiums and I love them, totally worth the $40.</TD></TR></TABLE>

wow, 40 bucks...and i thought i was big spender with my 2 dollar each plugs(NGK coppers! )