Interesting, project farm tests techron, sea foam, and MMO in the gas
 

This guy does some interesting stuff, but this is probably the most interesting, and he didn't shout through it which seems to usually be the case in his videos.

This probably doesn't exactly mimic what we'd see in a car, but it's probably a good indication. I wonder what sort of gas he was using, top tier or not top tier.

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Interesting . Personally I think looking at test results after 6 months or so would be better . I don't care what Chevron says one tank is not sufficient to clean a fuel system including the combustion chamber .

Good question. They all have additives but he surely used the same type of gas in the test.

Can the public buy non-additive (fungible) gas?

I'm sure all of the gas in his test came from the same gas can, so all the same.

Top Tier gas has certain amounts and types of additive, and they make a HUGE difference in the amount of deposits left by the gas. I don't know what non-top tier gases have, but apparently, it's likely to be inadequate.

Even just the first 1:20 of this video is interesting. The whole video is ~7min.
"Top Tier" is a certification that has standardized tests that require maximum amounts of deposits left per intake valve.

According to the video, non-top tier gas in the test left 660mg of deposit per valve during the standardized test, and the top tier gas only left 34mg of deposit per valve.
And apparently this year there's a "top tier plus" coming out that is essentially the result of the new Direct Injection motors.

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I have not used additives in a long time. I did recently do a test on gasoline. There is a difference. At the dragstrip I was getting knock retard on 93 octane from Sams. I added 5 gallons on 110 race gas to 5 gallons of Sams 93 and got zero knocks. I did this to be sure I had no mechanical issues. I tried 93 from Caseys and also got knock retard. Finally tried 93 from Sunoco and got almost no knock retard. So, when I race I will use Sunoco 93.

Interesting. How do you know you were getting knock? I assume something running an aftermarket ECU?

You've also got to be careful about the specific station. I used to live down the road from a Chevron station and almost always got my gas at that station (in a different car from the Porsche). I had noticed pinging in our cars from time to time. I had to get gas at another station besides my usual Chevron because I didn't have enough gas to get back there. I got gas at one of the non-major brands that you'd expect to have cheap gas and additives. I filled up from that non-name brand station and the pinging immediately stopped (the car had been nearly empty). I completely stopped using that Chevron and never had pinging again. I don't know if they just had crap tanks that leaked or if they were "topping off" their tanks with water or what.

I datalog the stock ecm with HP Tuners. (borrowed) I started doing it because the car was very inconsistent at the track. Was amazed at the difference in the gasolines. FYI, I get bored and am always looking for a problem to solve.

Cool! I've got a Durametric and have considered hooking it up to the boxster for my commute to log the data that is available. I'd like to see the various temps, pressures, etc... over the course of a commute.

That is a good tool to have. I had it when I had my Cayman S. Mostly used it to reset oil change. Never actually saw the light because I did the oil change after 5k miles. Also used it to turn off air bag light when I killed the battery. I did datalog it a couple times just to see how it was running but never had any problems running. No way I would own a Porsche without Durametric.

I haven't watched the video, but I have used Techron.

The SC had been using a bit more fuel than it used to. But otherwise going well. I poured a bottle of the Techron into a nearly empty tank and used that then did a smalll fill up and another Techron. Wow, it was like driving a new/different car. And the fuel comsumption dropped back to normal. I swear by the stuff.

My usual fuel is 98 RON octane Mobil has some sort of "engine cleaning" additive, but I think the Techron cleaned a dirty injector.

I don't care about engine deposits, really. I do care about clogged injectors and carb orifices. On anything that gets limited use I dump in some seafoam or techron. All the power equipment gets ethanol free and a good dose of seafoam at the end of its season. And I leave the carbs filled-used to drain them but have much less trouble with eth free/seafoam/full carb.

I run fuel stabilizer in my cars that sit much

My fuel injected bug liked a bottle of Techron, did it the tank before the oil change, every other time about. I bet I did over 150 oil changes on that car

Best friend swears by thst Seafoam stuff to get cars to pass smog. He would spray it down the intake while revving the motor. Made a huge cloud of smoke. Changed the plugs and the oil, bingo every time

Interesting I use my 91 octane ethanol free in my 85 911 with a 3.6. It just seems to run better and better the more I use it. I no longer use stable. I wonder what additives has in it?