Reviewed by Roland P (San Antonio, TX) Reviewed for a 2007 Chevy Silverado — May 09, 2013 8:32 PM

Ordered the plugs for my gas 6.0 engine 2500hd w/t 2007 ,, worked great for the 1st couple of days but had trouble misfire on them engine rattled at idle and started to hesitate on inclines .. Went to the NKG IRIDIUM PLUGS..went back what my local parts warehouse recommended ...sounded good but no workie!

Reviewed by Ryan O (Minneapolis, MN) — Apr 17, 2013 8:20 PM

They have improved my gas by 1-2 MPG!

Reviewed by Michael M (ROUND ROCK, TX) Reviewed for a 1999 Chrysler LHS — Mar 21, 2013 8:17 AM

Car was running leaner, no loss in power and I noticed my gas milage go up by at least 3mpg.

Reviewed by gabe L (boise, ID) Reviewed for a 2006 Kia Sportage — Feb 19, 2013 10:57 AM

This is the best plug you can get for seeing an improvement in power and gas consumption. I run them in all my cars/suvs.

Reviewed by Luiz D (WEST PALM BEACH, FL) Reviewed for a 2010 Suzuki Kizashi — Feb 05, 2013 8:44 PM

These spark plugs function fairly well in a city situation, but in the highway, however, they are abysmal. My MPG dropped from 29.1 to 27.2 on highway, but as soon as I leave the highway it usually rises to about 27.4. The instructions that came with it are very easy to follow and installation is a breeze (gaping required). One thing that you will read on some of the reviews is that there is a RPM drop when in idle, and this is true, in idle my RPM was around 500 as oppose to the typical 700.

Reviewed by Steven B (WEIRTON, WV) Reviewed for a 2008 Hummer H2 — Feb 01, 2013 9:34 PM

Replaced my stock plugs with the Pulstar plugs along with a set of Accel Ceramic Plug wires. Noticed a slight increase in power and picked up about 1 mpg.

Reviewed by Logan B (PHOENIX, AZ) — Jan 11, 2013 5:16 AM

I installed 8 of these myself in an older Lexus LS, and on paper I reduced my emissions by about 50%. I didn't believe it, but there you go. I had it tested before and after in Arizona. My car was amazingly built in the first place, but somehow got even smoother after putting these pulse plugs in. I don't know about longevity yet as I haven't aged enough. Highly recommended so far.

Reviewed by Elmer G (Port Byron, IL) Reviewed for a 2008 Honda CR-V — Nov 20, 2012 7:46 PM

Saw an immediate improvement of 1 to 2 mpg; over the next few thousand miles, mileage improved another 1 to 2 mpg. I was amazed - I guess I thought a spark plug is a spark plug. Not so! Get these, they are as advertised.

Reviewed by James C (BRIDGEPORT, CT) Reviewed for a 1999 Land Rover Range Rover — Oct 08, 2012 8:27 AM

This is a great mod! A no-brainer for the $. Good conventional plgs cost about the same! My 99 Range Rover 4.6 is getting 25-30% more miles per tank. 3/4+ mpg. That is considerable and will pay for itself by my 3rd refill. BTW, they're rated for 100,000+ miles. I usually have to change plgs every 15-20k in this harsh New Eng CT climate. Dont forget to discount ur battery n use boot deelectro grease to insulate xtra spark into capacitor. -j

Reviewed by Tony M (Grantsville, UT) Reviewed for a 2006 Pontiac G6 — Oct 05, 2012 5:17 PM

I upgraded to these from stock, and immediately I could see a difference with the way my engine runs. Gas consumption hasn't been dramatic, but improved a little. Glad I got these.