gas

[bigry2004]

i made a mistake! not paying attention, and very tired tonight on a drive home, i stopped to get gas. i hit the button on the left which is usually 87 octane, well i got 93 premium and didn't realize it until i got 4.6 gallons worth. i then continued to fill up the rest of the way and got 8 gallons of 87 octane. will this affect my driving, or mess up the fuel system economy much or not enough to notice? thanks

[JC327]

Won't hurt a thing, might even run a bit better than usual but you probably won't notice any difference.

[GMMerlin]

Wont hurt a thing in the short term.
Using higher than needed octane in your vehicle over a long period of time can cause some undesireable driveability concerns.
Higher octane fuel burns slower (and evaporates slower) then regular fuel..this could lead to difficulty starting and carbon build up on the valve faces.

[DINO55]

Bigry2004

The only thing you hurt by using 93 octane gasoline was your wallet.

[BlazerBoyLT98]

You are perfectly fine, just don't let it happen again Go with what GMMERLIN said cause that is exactly on the money correct.

[93LT]

Here is something to ponder

93 Vortec 4.3 Blazer

In town driving with 87 octane netted 14.7 MPG
Same driving only with 90 octane netted 17.0 MPG

Highway driving with 87 octane netted 15.8 MPG
Same driving with 90 octane netted 20.4 MPG

I didn't notice all that much difference in power and performance between the two grades, which sort of surprised me. However, the fuel economy stood out. With fuel prices constantly on the move, it is hard to put a cost analysis on it, but I'll try.

Around here, we have 87, 88, 89, 90, and 91 octane. Typically, there is .15 a gallon difference between 87 and 90 octane fuel.

Lets say my mileage remains true per octane used. At 15.8 MPG and fuel costing 2.15/gallon, driving 1 mile would cost me approx. .1361 cents using 87 octane. When using 90 octane and netting 20.4 MPG at a price of 2.30/gallon, driving 1 mile cost me .1127 cents. This is my highway fuel mileage expense.

In town driving yields the same results, showing 90 octane to actually cost me less per mile driven then 87 octane, but at a much narrower margin or .1353 cents per mile for 90 octane and .1463 cents per mile at 87 octane.

I bumped down to 89 octane last night and will run a tank full through, fill up again with 89 octane and see how the Blazer fairs with 89 octane fuel.

[BlazerBoyLT98]

Originally Posted by 93LT

Here is something to ponder

93 Vortec 4.3 Blazer

In town driving with 87 octane netted 14.7 MPG
Same driving only with 90 octane netted 17.0 MPG

Highway driving with 87 octane netted 15.8 MPG
Same driving with 90 octane netted 20.4 MPG

I didn't notice all that much difference in power and performance between the two grades, which sort of surprised me. However, the fuel economy stood out. With fuel prices constantly on the move, it is hard to put a cost analysis on it, but I'll try.

Around here, we have 87, 88, 89, 90, and 91 octane. Typically, there is .15 a gallon difference between 87 and 90 octane fuel.

Lets say my mileage remains true per octane used. At 15.8 MPG and fuel costing 2.15/gallon, driving 1 mile would cost me approx. .1361 cents using 87 octane. When using 90 octane and netting 20.4 MPG at a price of 2.30/gallon, driving 1 mile cost me .1127 cents. This is my highway fuel mileage expense.

In town driving yields the same results, showing 90 octane to actually cost me less per mile driven then 87 octane, but at a much narrower margin or .1353 cents per mile for 90 octane and .1463 cents per mile at 87 octane.

I bumped down to 89 octane last night and will run a tank full through, fill up again with 89 octane and see how the Blazer fairs with 89 octane fuel.

You do make an interseting point. To tell you the truth I had or well a girl friend of mine had a 98 Chevy Monte Carlo. Only filled it with super cause her dad made her. So it was getting either some brand 93 octane or Sunoco's 94 Ultra. Got the 94 most of the time. But I totalled my car and took her car for about 6 months because she took the bus into Boston anyway. I started filling hers up with 89 octane and it ran as smooth as silk, got incredible gas mileage, and had more power. I shit you not when I was getting an extra 60-100 miles per tank, I was blown away. I bought a grand prix, same thing I satrted using 89 and got great gas mileage and more power. The I boguht a stratus and I know all it ever used was 93, I did the same for almost a year and then put 89 into it and the same thing happened, great mileage and more power. I might start putting it into the Blazer. But our trucks come set for 87, witht he timing and everything else so anything higher with out prolong use is fine and I doubt 89 will hurt anything.

PS Word of advice and you can agree or disagree, I should probably start a thread on it but I will leave it ehre for now. DO NOT USE gas that has certain additives in it, like MTBE and I believe there is another one out there too. WHat the gas companies do is they buy cheap gas and use these additives that bring the octane level up a few points. So you might be pumping 87 octane in and really only be pumping 84 or 85 but with the additives they tets higher. Problem is that not only do O2 sensors not like those chemicals but they go stale quick and only will harm your engine over time. I have found the additives I am talking about at Cumberland Farms and Gulf gas stations. SO please do yourself a favor and stay away from those gasolines where additives have been used to increase the poor quality of their cheap gas.

[PBking82]

Pshh, 87 is for wimps. Real men use jet fuel!! LOL. I got a buddy of mine who just got a job at the airport, working in the fueling station; and he was like YO! I put that in my truck and holy crap that thing sounded like a frickin dragster! Said he can steal pretty much however much he wants. But, i'd be afraid to put that in my tank, and have no real performance cars just laying around. Peace-

[04 blazer]

Originally Posted by PBking82

Pshh, 87 is for wimps. Real men use jet fuel!! LOL. I got a buddy of mine who just got a job at the airport, working in the fueling station; and he was like YO! I put that in my truck and holy crap that thing sounded like a frickin dragster! Said he can steal pretty much however much he wants. But, i'd be afraid to put that in my tank, and have no real performance cars just laying around. Peace-

He may have put aviation fuel in his truck, but I doubt he put jet fuel in it and it still ran. Jet fuel is kerosene.

[dmbrisket 51]

aircraft fuel is regular gas with an octain of 160, and would burn so slow and cool that he would mess his cat up with the burn... and jet fuel as 04 blazer said is K and not petrol

[93LT]

"Said he can steal pretty much however much he wants."

I'd find a different friend, this one is liable to get you in trouble.

I too worked at an airport in my younger days. Our regular airplane fuel was 101 octane (blue in color), sold for around 1.45, back in the day when premium was about .95. We also sold reugular 87 octane for the smaller 4 cylinder planes such as the Cessna 150 and the little experimentals that would come and go.

Like the others have said, Jet A50 is kerosene, more or less.

[BlazerLT]

You will not net any real gains from using higher octance when the engine is tuned for 87 and has knock sensors installed.