The Dakota manual claims that using anything other than 87 octane will provide no benefit, what do you guys think? I know for sure that there is no difference as far as mileage is concerned. I typically use 91, but I have used 87 to compare (and measure). I'm not sure that I've noticed any real difference in performance either.

 

only if you have superchips imo

 

Looks like I need to save some money and get one of those.

 

Yea, I use 91 (the highest I can find out here) for my superchips tune.

 

sunoco 93, and with my mods, its a head turner, but depends where you live also, in the winter run a higher grade octane because they put the chemicals in the gas to help from freezing, where the summer a lower octane is better,

 

It depends on your engine. The 4.7 HO (at least in my year) recommends 91, but if your motor is designed for 87 it is a waste of money, plain and simple, to use anything else. Do not get fooled by the word "premium": it is just a marketing device, like "shampoo, rinse, repeat."

The Superchip solution only applies to the engines that come with a 91 recommendation.

 

Sunset you nailed it. Unless your racing or live above 5000ft, octane won't make a difference. Some people come up with some crazy reason why you should. In the winter depending on where you live they add chemicals to the fuel to prevent the fuel from freezing. But most. People don't know that if you buy gas From say reno, Nevada and put it into your car in Florida or in the mountains of Colorado, it will run like crap . Why? Because of the difference in air, barometric pressure, humidity etc. In Colorado they add more butane to help it combust better than in reno where the air is drier.

 

Why are you guys clouding a good debate with facts? (LOL)

Higher Octane does one thing and one thing only - it delays spontaneous ignition (knock). Unless you have modified your engine by increasing the compression ratio or boosting the air charge, you are filling the pockets of petroleum co. shareholders. Again, unless you have somehow increased the pressures inside the cylinders, use what is recommended in the manual.

 

I have read this before. I suppose I should accept the facts. I filled up with 87 last time I got gas; it sure is easier on the wallet.

 

what about e-85 vs 87?

also e85 with sc tuner?

e85 power loss/increase?

i know the mpg will go down