What type of gas do ya'll use? I know it says on the inside of the fuel door premium fuel recommended, but what do ya'll use? I am using premium as of right now. Does it make a big difference or is it bad for the engine to put the cheaper stuff in it?

 

Just make sure you satisfy the minimum RON (MON to be more specific), cheaper fuel could cause misfire or detonation.

 

i personally use diesel fuel. i know i know, it sux, but hey, my 8 LOVES it
















hahahaha, jk jk. i use premium in my baby

 

I first want to state upfront, I work for an oil company, and I get a discount on my fuel....

For the first two years, not a drop of gas less than 93 octane entered my tank. I was conscientious about it, 100%.

Then I tried 89, the cheap stuff, the junk....

No difference.

My butt-dyno had been finely calibrated over the previous 24 months, yet could not feel one iota of any change! Believe me I wanted to feel the diff, there was my livelyhood at stake - if it made no difference, why was I making 93 octane at work...was my whole life a facade?

Probably.

I should have listened to Mr. RotaryGod, and the other rotary gurus - the Renesis ran just as well on low-carb, diet, sissy, weak, no additives, cheapo 89 octane gas, as on premium, top-tier, full package "formula" Optimax.

So now I just fuel up at my local truck-stop cardlock. They don't even HAVE a premium pump, just the cheap stuff. (though I DO know they get it from MY refinery! I'm stupid, not crazy! )

89 for me!

S

 

You know I've heard that before...

I don't notice much difference inthe 94 I just put in. Infact if anything it feels like the car has less punch...

??????????????????????

Hey, I may just save myself a few $K a year and go back to Regular old 89! Thanks, G.

 

where are you guys located at that your regular is 89 octane? out here in cali (so. cali at least), regular octane is 87.

 

Premium fuel only baby! Yea!

 

Same I think in GA. It goes 87, 89, 91.

 

I used Chevron 91 for first couple months, then switch to 87. No difference.

 

Considering premium is $.30 more a gallon than regular, and that you use a tank a week, in one year you might spend about $.30 * 15 gallons * 52 weeks = $234 extra. Granted, if it's not needed, I would rather have $234 in my pocket at the end of the year :-). But just saying I don't think there is necessarily a huge cost savings to using regular over premium.

 

Higher octane gas burns more evenly, but slower. That's why it prevent pre-detonation. You'd actually have to advance the timing to see any performance benefits.

 

Gotchya...
As for the octane I'm pretty sure here in PA it's 89, 91, 93 and the super High is 94 at most stations. Then again regular these days is about $2.45 per Gal.
93 is about 2.75 They usually have a .20 jump from reg to med and .10 from med to high.
It also depends on the station.

I fill up about twice a week. so yeah it's about $500 a year maybe not a thousand.

Thanks... G.

 

As mention the gas itself isn't a power adder. What you are really seeing with the different ratings is the chemical makeup of the gas itself.

87, 91, 93 etc is refering to the basic mixture of Octane and Heptane within the gas. Octane by natural is the most resistance to detonation. This means if you take a enclosed container you can compress more Octane in it before a detonation will occur.

Heptane is the opposite, this will detonate under very little compression.

Therefore low compression engines naturally do not require the higher compression resistance gasoline and thus 87 is used.

Higher compression engines need to compress more air/fuel mixutre before the mixtures reacts.

This isn't really much of a need these days with fuel injectors that can help to get this mixture even more accurately. This being said though, the on board systems do not read what type of gas is in there, their programming is based off of the recommanded rating.

And those that think that oh the higher octance has more fuel additives in it. No, all fuel is require to have the same additives. Now some gas companies may add a little market gimic to their pricer gas, but thats all it really is; marketing. In fact all gas comes from the same oil, it is only once at the company are special additives added. However all of Shells gas at the pump is the same across all octane ratings. The 87 isn't any more special than the 93 etc.


So are you going to blow your engine running 87? MM most likey no. However do you increase the change; yes.
Is is a huge increase, well thats something for the rotary wizards and fuel gurus to discuss.

I've run 87 before but for the most part stick with the 91 since it is only 5 cents more than the 89, and 10 cents more than the 87. Not a huge difference in price, about 1.50 difference with each fill up, which is like 4 a month, so about 50 bucks a month...meh I'll drink less starbucks to save money or eat out less often.

 

I have to fill up 3 times a week with my commute to school. With the increase in gas prices, I dropped down to 89 with this last tank full. (We have 87,89,93 in Florida). My car seems to buck and shudder at times. I'm putting back in 93 today. It's only 20 cents more a gallon and isn't going to break me. It's just that I don't get my student loan deposit until next week, so I was trying to conserve. My husband makes me pay for my own gas.