I've talked with some buddies and heard from various people and sources about the whole Higher Octane pump gas. I am personally running 93 Octane in my GTS. The 4b11 is a 10:1 compression ratio engine, which in my mind is a fairly high compression NA engine. Thus my reasoning for 93 octane. Am I just noobing this up and spending the extra cash on my GTS at the pump. I definitely would like to hear from you guys and your opinions (waste of money/justified on compression of 4B11).

 

You are wasting money. The factory car would never be designed to detonate with the recomended octane rating. Also 10:1 is not very high for an N/A engine.

 

Werd. I had a feeling it might be the way you described it. Guess I'll be saving money at the pump now.

 

I actually seem to get better gas milage with 93 octane versus the regular 87. A full tank of gas seems to last about 30% longer. It's definitely strange.. Maybe we just have **** regular gas here.

 

Yeah, I seemed to get somewhat better mileage too. I got the nav and I check my MPG and all that stuff. I'll see what 87 will be running for a full tank.

 

gas is gas to me.. what ever saves me money.. college student = poor... it says to run 87 on the manual so 87 it is.. now on my mom's lexus hybrid they want her to run 89 at most.. so i think running 93 on our car is pointless...

 

Too high of an octane may burn too cool and create and/or increase carbon deposits in your combustion chamber, exhaust ports, valves, etc. and may also damage your cat. So, if your fuel isn't burning hot enough, you're losing performance and gaining (possibly) all that fun stuff above. Save your pennies and use what the manual calls for.

 

Hopefully changing back to 97 now will be in time that I didn't do all that nasty stuff to my engine. I would feel like such a noob if I started out my new car by killing my engine already . Thanks for the advice....87 for me now *slaps forehead*

 

That too is incorrect, well sort of. It is true fuel may not ignite. But depending on the quality of the fuel, generally higher grades of fuel, specificly those from Sunoco are cleaner with reduced levels of sulfer which add to the corrosive elements in an engine / exhaust system.

That said, the costs stilll dont justify the use of higher grades, our engine does not compress fuel enough to make use of the octane tolerance.

Thru the life time of your car, thecost difference, could buy you a new engine.

Get my point

 

All gasoline is refined to reduce sulfur levels. But the big refiners (like Sunoco) are held to a stricter per-gallon sulfur rating than smaller refineries. So, if you still want to use premium gas, take evo_souls advise and at least stick to a name brand.

 

You guys think it would be worth it to run some good fuel system cleaner like Gumout brand stuff through it when I change back to 87, to clean things out just in case carbon build up started to happen from running the 93?

 

No. Try to stay away from that stuff.

 

That suff is actually bad news for your engine??

 

^Don't use it, even bigger waste than higher oct gas!

 

So, I'll just hope I didn't prematurely help the carbon buildup. Wish I had less 93 still in my tank so I could get that out and run 87. Feel like such a noob