I got on my last long trip 29-30 mpg doing 75-80 mph
OEM plugs which are NGK BKR5EKU used to get 26-28mpg @ 192k miles
after you get everything fixed don't run the oem plugs, they are too hot, if you want to run iridiums then get plugs that are 2 heat ranges colder and you'll be better off. you can also run copper plugs, i run ngk coppers that are 2 heat ranges colder and have had no issues at all.
I replaced my plugs with NGKs about 10k miles ago, I got them on amazon for about $12 a plug I think, engine runs great with them.
NGK BKR5E... Dual or single electrode, they both work well. These are the best plugs for these motors imo. They’re some of the cheapest as well.
I just installed STI plug wires and NGK spark plugs. After the install the car tried hard to turn over again but still gave me the same issue as before. Turns out the motor was not getting gas so I didn't need to get new plugs/wires, but I am glad I did because now my car doesn't idle weird anymore.
Car's is running smooth with the new wires and NGK spark plugs.
Ditch these plugs and pick up some NGK's gapped to .028 and your misfires should go away. If the misfires are still present, start looking over your coil harness with a fine tooth comb and look for any cracks.
I get a random misfire at idle, but nothing in boost surprisingly. Hey, I'm just goin with what works. And Im running 19 lbs on a T3/T4.
I changed the plugs thinking that what it was. (it was not). I thought it was the coil packs so I bought a new set of four, which I have NOT installed yet.
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