I use NGK on my supercharged Roush. The recommended for supercharged engines is 28 to 30k miles. The only thing that you need to research with the e85 tune is whether or not you need a hot plug or a cooler plug. Roush calls for a cooler plug
I actually had a generator that would take 4-6 pulls to start with the "Torch" brand sparkplug, but starts in 1-2 pulls with an NGK.
BP7ES is what I have in my Wgen. Cranks 1st turn over everytime now since I switched and instead of rolling over 10-15 times with the crappy Torch plug now takes 1 second.
Quicker starts is a result...I just followed the crowd on this one and from my days at NAPA, i was a NGK and Bosch spark plug fan back then.
On my old Jeep Wrangler, the only plugs that it ran well on were NGKs.
Engine starts better and in some cases the engine runs smoother. The big issue now a days is getting a legit NGK instead of a Chinese knockoff.
NGK BP7ES replaced the torch that took 3 to 6 attempts to start on LP from large tank every time. Now starts on 1 try every time w the NGK.
I been using ngk BR6HS plugs for years.
NGK all the way, 100% of the time.
I don't trust hks, too many copycat them.
I just changed out my sparks and found out the previous owners put these garbage plugs in it lol replaced with quality Iridium NGKs
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