Denso and NGK have fared better than Autolite in my vehicles in my experience.
I owned my cruze for 5 yrs and had no problems with the NGK iridium. I paired it with a coil pack I ripped out another cruze.
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.
I recently put in NGK LKAR7BIX-11S (93501) and some cheap amazon coils. A coil failed and I just replaced it all to be sure.
Put in NGK ILKAR7B11 (4912) around 186k miles. I've burned so much oil and did a piston soak at 205k~. I scrubbed the tips with a wire brush but it didn't do much. Lots of carbon. I really don't notice a difference.
Ngk are trash. Go with oem Bosch
Be careful where you buy your plugs. There are counterfeit NGK plugs out there. I found out the hard way. I purchased off of Amazon. Mine melted before I could even get a mile in to my session.
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