shammerman

If you have a 991.1 it’s the same.

The Roon

Oh great!
Learned something already!

BGLeduc

This is what it says for my 2015.

The Roon

Great info!

Pakman996-991.2

Myself and a few others are running full e85 on tuned 991’s. Moisture is not really an issue if you don’t let the car sit for an extended period of time. I daily drive mine

DR911s

I have a 2017 C2S which is a 991.2. If you can fill your car's fuel tank with ethanol free gasoline of the correct octane rating, you will likely find during a highway cruising trip that you will obtain slightly better MPG. This logical because ethanol contains less energy per unit volume than gasoline. In my NE Ohio area, Sheetz brand offers E-10 and E-15 grades of gasoline and the E-15 is priced lower per gallon despite having a slightly higher octane rating than the "regular" grade of E-10.

IRunalot

I have been running VP Racing fuel as there is a station about 15 minutes from my house. They have all ethanol free fuel in 98, 100, and 103 octane. I know the higher octane won’t get me more HP probably losing a few due to the fact that higher octane fuel needs to have the timing advanced beyond what a 93 octane tune can provide.

Having said that the car runs considerably smoother, my fuel mileage has increased by 4 MPG with the same driving and my mediocre Cobb OTS tune does feel a bit stronger at the top end in hot weather then it did before. I live in Miami, so it’s been hot and humid for a few weeks now.

I think the results are good, and my next plan is to do some data logging with the 103, then the 103 mixed with REC 90 50/50. I can get REC 90 anywhere in my area so if I need to top
off it’s easy to do so. When I finally get a custom tune, I will likely get a 103 and 93 tune as I can subjectively feel a difference, but I’d like some objective performance data. I’m looking for timing, fine knock, knock detection, and boost.

Overall, the car runs much better when cold and at high temps if you’re pushing it, that heat-soaked turbo slight drop in performance has disappeared.

The major downside is cost, it’s 9-14 bucks a gallon. I’ve been running the MS103 at 14 as this is a weekend car as I’ve worked from home for over a decade.

The Roon

The Ethanol free where I'm at is 90 octane, so if I use that in conjunction with an additive say like Driven Denfender, I'm thinking I might be ok.
If not, there's 93 all over here, but it has E10, which according to J Speed, is 90 before the E10.
I'll have to try a tank and see what it's like, then again my car will be driven on a semi-daily routine.

IRunalot

Other then the VP Racing fuel all of the Ethanol free gas here is 90 octane "REC 90", you can also try BOOSTane, this I know actually works to boost octane. Driven Defender is a great product but will not boost octane as far a I know.
You will be fine with an E10 blend but non-ethanol is a better fuel overall, Not counting the guys that are tuned for E85 or one of the other high Ethanol blends.

The Roon

Yes, I have used Boostane in my Camaro SS LE1, but thought I'd try the Defender since it says Boost on the bottle and seems like it was made for the Porsche engines coming from LN Eng and J Speed. Then again I need to verify which is better or less harmful over all.

Thanks for the link...I still get their emails too.

IRunalot

The products from Driven are excellent, I'm gong to move over to their DI-40 oil as well.

I've never payed around with fuel as much I have lately since watching that PCA video a few weeks ago.

The Roon

Yes, when my oil change is up, I'll be using the DI40 as well.
Watched the Tech Talk videos on Fuel, Oil and Oil Analysis, and it was very interesting to say the least!
They have a few other ones as well with just J Speed, but all are good info.

I've always used Blackstone, but I think I'm going to try Speediagnostix and see how detailed it is.
I may do a VOA just to see how different the oils are or not.

Jack F

Speed Diagnostix did a VOA on Mobil1 0W40. It is barely a 40 wt in virgin state.

IXLR8

Did he bring that up to Mobil / Exxon?

And is his equipment certified to NIST?

Jack F

That would be a question that you can ask. Post a comment on the YT vid. He will respond.