You sir, are a moron. Enjoy throwing away your money much?

 

Wow... I thought these forums were supposed to be pretty laid back? That seems a bit uncalled for.

 

Haha, well look. He came in with the high and mighty post, saying that his way is right and the person that wrote this article is stupid, and then finished it with a screw you.

I don't want someone to read this thread and think that it's true and not research the topic, so I have to shoot down the idea.

 

The entire drive I didnt use cruise control once, but I was drafting about 3 feet behind my dads vette at 80 mph. From my experiences i get the best MPG between 75 and 78 mph, anything above 78 the MPG drops like a rock.
I forgot to mention that I have the car lowered a bit, KYB AGX 4 ways with eibach springs. Im wondering if lowering helps MPG or not. Has anyone actually tested this?

There was no intent in being all high and mighty. If it came off that way, Im sorry. From my understanding of it the higher octane doesnt ignite as easily and it burns more completely when it does ignite. If you're buring more of the gas while its in the cylinder you maintain more power and send less unburnt gas out the exhaust pipe which means less wasted gas. Less wasted gas means better MPG which turns into more $$$ in your pocket. In the end it probably works out close to breaking even.

For example, my cousins saab senses the difference in octane, when he puts in 93 his DTE says ~450 miles, when he puts in 87 the DTE says ~375. After taking long trips with him in the car, you notice the difference by how often you're filling up the tank.

Anyone have an engine dyno and a spare engine to test the higher octane theory?
Also, if I am wrong, please correct me.

 

Here's a thought- the L36 PCM features "High Octane" and "Low Octane" spark tables. I'm not an expert in this area, but the HO table definitely commands significantly more timing than the LO table- more timing equates to more efficiency, which equates to better gas milage. You're generally going to be running the HO table- does anyone know the threshold for dropping to the LO table with a stock L36 PCM? If it drops to the LO table after seeing any KR, than running higher octane gas would probably yield better mileage on longer trips, as just about any engine is going to see a tiny bit of detonation on a long trip (heat soaked block and heads combined with strains of hills/passing/part throttle acceleration).

 

Ok on number 3 this lady doesnt live in Illinois does she. The difference between counties is crazy. I never fill up in cook county unless I have to so for odd reason. I fill up in the surrounding counties and save nearly $200 to $300 a year.

And I think number 6 was done on Mythbusters.