3-Count 20-oz Chevron Techron Concentrate Plus Fuel System Cleaner EXPIRED

Premium or aka 91 octane are for high compression vehicles and it has nothing to do with having more detergent in cleaning your engine. The truth is, it is harder to burn a premium or high octane gas because they are design that they won't do premature detonation. If your car doesn't require this and did not mention it in your gas cap or manual, don't use it or you're just burning your money.

Note, some cars with both port and direct injection are usually high compression vehicles that are able to use non-premium and premium... and yes, there is power difference because the car computer (ECU/ECM) will advance timings. Some force induction vehicles has similar effect too. Though there's power difference, high octane doesn't have to have more detergent aka Techron or Vpower or whatever marketing gimmick they call them.

That's some blatant misinformation right there. Fuel works much in the way oil does, there is a base oil/fuel that these companies purchase from the refineries (which does mostly all come from the same plants), but then the individual companies further refine with their process, add their additives and top treat it before sending to their fuel stations.

Further, there is an ASTM test known as the IVD and one purpose it has is to run what's known as a dirty up clean up test. It runs a test with base fuel and no additive, then inspects the engine for deposits and other harmful effects. Next it runs whatever fuel to be evaluated through it and inspects again when it completes. However much improvement is measured is the metric for quality level of that gasoline.

And lastly, for whatever reason, these companies do put more of their additives in their "premium" fuel versus regular. It's good practice to run it in your vehicle every once in awhile for that reason but if your vehicle requires premium, you need to run it. Its chief reason anyway is to control the explosion better and with a high compression engine, it needs to be there to mitigate detonation or serious damage will occur.

I'm not speaking from internet research, I've worked in this industry for decades.

Never felt any difference after using it. Maybe because I always use Shell or Chevron gas.