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Hey gays and gals,

I am trying to verify Mark VIII 4.6l's need premium gas correct. My uncle has a 96 and I could swear, the gas gauge says premium unleaded only. So some input would be of some great help.


thanks,

Justin
 

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Discussion Starter #3
ok thanks thats what i needed
 

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Premium is reccomended but not required. It will likely pull timing with regular.
 

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95BLKLSC said:
Premium is reccomended but not required. It will likely pull timing with regular.
that be what the knock sensors are for
 

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Yeah but that was the older slower EECs. You will still get detonation before the sensors get the signal to the EEC and then the timing is pulled without some changes made in the programming.
 

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yup

My 97 mark viii runs like a$$ on anything other than premium. I definately think it's worth the extra cash for the performance and lack of detonation.
 

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My Chip'd 97 does not ping at all on 87 octane, but I do notice a definite decrease in power.

If I'm just cruising on a trip or something, I run 87 octane (why spend the extra money to just burn it out on the interstate?). But if I'm going to go to the strip (or expect to do "spirited driving"), I'll fill up with premium. :D

Just my .02. :thumbsup:
 

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Lonnie said:
Yeah but that was the older slower EECs. You will still get detonation before the sensors get the signal to the EEC and then the timing is pulled without some changes made in the programming.
My cousin of mine, (Shes a chick), ran regular in her 04 aviator and ruined the motor and had to be replaced recently. Her dad, my uncle works at the dealership so she got a new motor. But detonation was still present and the 87 octane ruined that motor. It seems the EEC could not pull enough timing out of the motor to keep it from detonating. THe MPG decrease and performance benefit doesnt make it cheaper to run 87. Part of the reason this happend is that she doesnt care, and shes getting rid of it anyway attitude.
 

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As long as we're on this subject.

My girlfriend recently traded her 99 Z3 for an 02 Explorer with the 4.0 V6. She insists on running Premium in it because it "gets better gas mileage with Premium". I told her that just didn't make any sense and she's wasting her money. The 4.0 was designed to use 87 Octane and anything higher than that is just burning money.

Is there any chance that she could get better mileage with Premium in an engine designed to run Regular Unleaded?
 

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lol I didn't think so either. Now all I've got to do is convince her that her years of "research" do not apply to the Explorer. She's always run premium. But then she has always driven cars like the Z3, a mid 80's Buick Grand National, an early big block LeMans.............
 

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Not true, I have a real hard time with the CV guys on this one. They want as much performance as possible with 87 octane because they constantly hear that the vehicles get less gas mileage with premium. Their support for this is that the engine was set up to run on 87 and that's the optimum fuel to ever run in it because of this. Anything rated higher is wasting money and will not make any difference in performance.

I'm no expert on fuels so I can't say whether the 93 will burn cleaner than the 87. I know all my vehicles always ran better with the good stuff and less deposits on the plugs. As for a something like a base Escort I don’t think you will see much difference, just my personal opinion but I could be wrong.

Now with that said, I couldn't begin to tell you how many people running around with a premium fuel performance program have reported they got better mileage with the premium fuel program than the regular performance program. So I've actually been able to turn around some of these people with that regular fuel is the only way ideas.

Also just because you don’t hear detonation doesn’t mean it isn’t happening. The truth of this is if you are hearing it than it’s already too late. The sensors are suppose to pick it up before it gets that bad and most do to a point. The newer vehicles are much better at this than our old ones.
 

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LOL Well thanks Lonnie. You probably just prevented a heated debate ending with me saying "put whatever you like in the car". :D I'll just let her put whatever she likes in the car. (LOL As if I have ANY power over her in that regard anyway)
 

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Traveler said:
LOL Well thanks Lonnie. You probably just prevented a heated debate ending with me saying "put whatever you like in the car". :D I'll just let her put whatever she likes in the car. (LOL As if I have ANY power over her in that regard anyway)

Yeah I know what you mean..... Has anyone ever found one that would listen...........NOT:bangwall: :bangwall: :bangwall: :bangwall: :bangwall: :bangwall: :bangwall: :bangwall: :bangwall: .....
 

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Theoretically, the higher the octane, the slower it burns. I don't think that it would give you any extra mileage. I love my premium performance tune... i don't mind paying an extra 3 bucks every 2 weeks. =)
 

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Lonnie said:
. The sensors are suppose to pick it up before it gets that bad and most do to a point. The newer vehicles are much better at this than our old ones.
Can programming make it so the knock sensors can pull more timing, if detonation is present, or do you have to set another program with more retarded timing?
 

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I know with my 97' Mark I got 2 months ago that my Mileage dropped quite a bit on the freeway with 87 instead of 91. Dropped to 21mpg instead of 23-24mpg. I still think I have other issues though also, 23-24mpg doesn't seem to be that great for a 97' LSC with the cruise set at 70mph either, then again its winter.
 

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AnthraxBird said:
Theoretically, the higher the octane, the slower it burns. I don't think that it would give you any extra mileage. I love my premium performance tune... i don't mind paying an extra 3 bucks every 2 weeks. =)
Good Call........Goooooooood call....:thumbsup:

I mean its only 3 bux........Why the hell not?
 
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