I had them in a Honda before I sold it last year. They worked well and supposedly last at least as long as Iridium, but they did nothing for mpg.

 

I had them on my turbo VW before I got my HiHy.

Compared to the NGK Iridium IX, the mpg improvement came later, after the ground electrode would have worn to increase the gap where there is a noticeable difference.

 

2VZ-FE, what mileage improvement did you notice?

And after how many miles with the ruthenium plugs did you notice the increase?

 

On my turbo VW, the NGK iridium IX mileage went down after 20,000 miles. The ECU was also tuned as well. So, the ruthenium HX kept on chugging along

for a 1zz, where the cylinder pressures are not that high compared to a turbo running 20 pounds of boost, the Ruthenium HX vs Denso Iridium Twin Tips? I’d get the ones that are less expensive

 

I don't know if this information can really help. But if you're replacing spark plugs. Check RockAuto's website, I like to use Denso or NGK parts a lot.

I bought NGK Ruthenium plugs. I wanted to give it a try the reviews I read around seemed positive. I read a lot of things about counterfeit parts being sold on Amazon and eBay so I ended up price-matching with Advanced Auto Parts. Feel free to give it a shot if you feel comfortable trying these plugs. If you don't want to try these plugs I would just stick with whatever originally came with the car. Probably some sort of Denso plug.

And to be honest with you. I don't notice anything different. I was just curious to try them because my spark plugs were due. I would say it maybe felt smoother for a day. But I feel like any new spark plug compared to an old one would make a difference slightly. My gas mileage is still the same. The only thing I can really think of that might be an advantage for the plug is the claim it's made out of a harder material "Ruthenium". So it could possibly end up lasting longer but at the time when I was researching about the plug. I couldn't find any long-term reviews anywhere so I don't know if the claim is necessarily true only time will tell. Buying this plug was more of an experimental thing for me. I was just really curious to try it for some odd reason. If this plug isn't something you want to try I just recommend going with the OEM plugs normally. I don't know the exact part number but it's generally some sort of Denso plug. I think I currently only have 15K miles on them and I don't have any complaints. Best of luck though.

 

I'm going try NGK Ruthenium next time. The price is about the same as NGK Laser Iridium anyway. Double check part number on NGK's e-catalog and use Rockauto's 5% discount code.

Modern engines are so well tuned there probably isn't going to be noticeable power increase. I'll see if there's smoother idle (which some reviews claimed) and maybe peppier acceleration (maybe not the same degree going from nickle/copper to iridium-ix with the thin center electrode).

 

I'm going try NGK Ruthenium next time. The price is about the same as NGK Laser Iridium anyway. Double check part number on NGK's e-catalog and use Rockauto's 5% discount code.

Modern engines are so well tuned there probably isn't going to be noticeable power increase. I'll see if there's smoother idle (which some reviews claimed) and maybe peppier acceleration (maybe not the same degree going from nickle/copper to iridium-ix with the thin center electrode).

You are most likely right I don't think you would notice a power increase. I personally never noticed a smoother idle but I noticed the acceleration was better for maybe a day but I didn't feel like a massive difference for me. Felt like it was the same as the old plugs the next morning. I got the DFE-designed plugs for my car not sure if users feel anything different for the PSPE-designed plugs.

 

NGK calls for DFE plugs, not PSPE plugs, so I don't know whether PSPEs would work properly.

 

Just select from the plugs in NGK's e-catalog and those will be fine. The only Ruthenium plug listed in the catalog is DFE.

 

I decided to be the Guinea pig and installed the NGK ruthenium plugs in our '08 Avalon a couple years ago. Car runs fine. No change in MPG though (26-27 combined).

 

Yeah I'm interested in trying out rutheniums as well. About the same price as Laser Iridiums anyway.