Pulstar Iridium spark plug ok to use?

[UltrAsOniC]

Pulstar Iridium spark plug
Need to know if the VX can handle a hot plug same for coils?
I am getting 13 mpg and would like to improve mpg so has anyone tried this plug or have any feedback as to max temp on head?

update
runs like brand new with these plugs

Features & Benefits
Ultra-high power spark plug replacement. With over 1,000,000 W of patented (13 issued patents) ignition power, the pulstar pulse plug creates a very precise, relative to timing, fast growing flame kernel (2X faster than spark plugs) that delivers improved performance and fuel economy while reducing emissions. The 0.5 mm fine wire iridium tip promotes reduced cycle to cycle variations in peak combustion pressure that results in improved throttle response and acceleration. The pulstar pulse plug has a lifetime warranty. Guaranteed• Pulsar has 10 times more peak power than a spark plug
• More horsepower
• Improve the performance of your vehicle
• Better than a spark plug


url for more update information
http://www.pulstar.com/main/PULSTAR-Home.asp?P=1