Premium or Midgrade...

Lownslowlsc

Lownslowlsc

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well. midgrade, chipped, and driven hard at 193k miles.
others will disagree of course.
 
I ran one tank of midgrade before the tune, and it didn't blow up. I only use premium now with the tune tho
 
UltimateSVT said:
Search, this has been discussed before. It's supposed to be premium unless you are chipped or I can't remember another mod exactly!
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most of the time, its more important to run premium when chipped because of the extra timing and leaner mixture.

except in the specific instance of being tuned for a lower octane.
 
I'm strictly premium 93 only from Chevron, BP or, Phillips 66 (ethanol free) @ pump 10 lol. Even with my lack of driving, the ethanol free is a bit steep on the price. I usually only put in about 8 to 10 gallons and every 3rd gas trip, I use STP fuel injector cleaner in the black bottle. That stuff really seems to keep it running smooth.

I never even look at mid grade or regular.
 
The car was designed for 93. Thats what you should run. Will it explode on 87? No but it will have less power due to the knock sensors pulling timing cause of the detonation.
 
The first 1993 and 1994 Mark VIII's I had definitely ran better on mid grade. Now my supercharged 93 is premium with occasional octane boosters and meth injection :).
 
Due to the stupid high price of gas around here ($3.87+/- reg, $4.05+/- mid, $4.25+/- prem), I'm having to run a mix of reg and mid. I just can't afford premium anymore. I used to run premium all the time because she just runs so good on the good stuff:D But I can't now. And I'd love to find some ethanol free gas, but there's only one place around here that sells it and they only have 87 octane and it's $4.00 a gallon or more depending on what time of the day it is. I've noticed my gas mileage dropping since I don't run premium exclusively anymore and that is unfortunate. It hit an all time low of 19.9 average this morning:( And has anyone else noticed that the price difference between the three grades is not 10 cent increments anymore? Now it's 12, 14, 15, even 20 cents difference between the grades. A few weeks ago when gas was relatively cheap, I saw reg for about $3.69 with mid for $3.84 and premium for $4.04 a gal. That was 14 cents from reg to mid and 20 cents from mid to prem:eek: I just don't get it.
 
according to the owners manual, it was designed for 91 octane, listed as recommended , but not as required.
dont yell at me, i am just saying what fomoco says.
 
Seriously???....$3.20 extra on a full tank is a lot of money to ya'll?...I know most of ya'll spend that much on stupid things every week...am I wrong?
 
Moes8 said:
according to the owners manual, it was designed for 91 octane, listed as recommended , but not as required.
dont yell at me, i am just saying what fomoco says.
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How dare you!

CobraStar_LS8 said:
Seriously???....$3.20 extra on a full tank is a lot of money to ya'll?...I know most of ya'll spend that much on stupid things every week...am I wrong?
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It's not much at all considering all the unnecessary things most people buy on a daily basis. I use premium 90% of the time. Usually the only time i'll put mid in is if theres more than a .15 gap between the two or if prices skyrocket. It makes me feel like i'm not getting gouged as much. Silly brain games is all.
 
LaserSVT said:
The car was designed for 93. Thats what you should run. Will it explode on 87? No but it will have less power due to the knock sensors pulling timing cause of the detonation.
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Exactly and it's even possible the slightly better mileage premium will give you will make up for the price difference. I have read articles, no I can't find em' right now, that claim just that.
 
Wish I could find 93 in California somewhere, but all we have is 91. I'm surprised with these emission laws that we're not just filling up with fumes. Oh ya, and they cost a billion dollars, too. Oh well, at least I'm not driving an Aviator anymore! That sucker was getting 10 mpg in town. Shoulda been driving a Class A bus for that :(
 
PenGun said:
Exactly and it's even possible the slightly better mileage premium will give you will make up for the price difference. I have read articles, no I can't find em' right now, that claim just that.
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No I got better gas mileage on mid grade also.
 
thaywood said:
Due to the stupid high price of gas around here ($3.87+/- reg, $4.05+/- mid, $4.25+/- prem), I'm having to run a mix of reg and mid. I just can't afford premium anymore. I used to run premium all the time because she just runs so good on the good stuff:D But I can't now. And I'd love to find some ethanol free gas, but there's only one place around here that sells it and they only have 87 octane and it's $4.00 a gallon or more depending on what time of the day it is. I've noticed my gas mileage dropping since I don't run premium exclusively anymore and that is unfortunate. It hit an all time low of 19.9 average this morning:( And has anyone else noticed that the price difference between the three grades is not 10 cent increments anymore? Now it's 12, 14, 15, even 20 cents difference between the grades. A few weeks ago when gas was relatively cheap, I saw reg for about $3.69 with mid for $3.84 and premium for $4.04 a gal. That was 14 cents from reg to mid and 20 cents from mid to prem:eek: I just don't get it.
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Do not run reg it will get worse gas mileage and end up costing you more and possibly harm the engine. My stock Marks (a 93-94) did best on mid grade. I haven't experimented with the 98 yet.
 
$3.83 - $3.88 here for 93 and Don is right, premium will help the car to run better and you'll end up having better mileage which will compensate for the price difference. The ethanol free is about $4.19 and it only comes in 93 and in only one pump (#10), at one gas station lol
 
I bought my white 97 at the beginnning of 2008. I paid $900 for it (and actually intended for it to be a parts car...). I've run nothing but 87 octane in it as a daily driver for almost 5 years now with no real noticeable loss of power. It still gets up and goes quite nicely, and takes my daily beatings like a champ.

It's currently at ~172k miles, although the current engine was put in at ~155k and only had 67k on it. I bought the car with 125k miles.

Now, the black 98 is a different story. I've always put in 93 octane ever since I first bought it, even before I got the "93 octane" tune for it...
 
Don Pfau said:
Do not run reg it will get worse gas mileage and end up costing you more and possibly harm the engine. My stock Marks (a 93-94) did best on mid grade. I haven't experimented with the 98 yet.
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Very true. She don't like 87 octane. That's why I don't fill it up with 87. I usually put 3/4 tank of 89 and fill the rest of the way with 87. I hate to do it, but I just can't afford the good stuff anymore. And she makes me pay for it with crappy gas mileage. But the last time I ran straight 87 (loooooooong time ago), it ran like crap, spark knocked, sputtered, and just acted pi$$ed off at me:D Sometimes I'll run an octane booster and that helps a little. If gas will go back to less than $3 a gallon :lol: I'll start running 93 exclusively again.
 
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