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post #1 of 26 (permalink) Old 04-29-2013, 09:36 PM Thread Starter
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Question MID UNLD Gas Grade?

Ok well the mechanic that helps me with my car told me once I replace my header- exhaust and o2 sensor I should start to use mid unld gas grade. He said its better and last longer and such. Now my questions are is this true? Should I? Why? Has any one else did this? Any pros to it? Any cons to it except my pocket lol ? Would this damage any thing if I do this? If I do change grade of gas in the first tank would it be fine with a mix of unld and mid unld cause I don't let my tank under half?

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post #2 of 26 (permalink) Old 04-30-2013, 03:06 AM
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I think your mechanic is full of it. You didn't change compression ratio.

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post #3 of 26 (permalink) Old 04-30-2013, 03:18 AM Thread Starter
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Now this is were I'm alil confused idk if he ment like fully switch over or every once in awhile fill up on midgrade cause i know my dad fills his truck up every once and awhile with mid grade and so did my grand dad with his calilar...
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post #4 of 26 (permalink) Old 04-30-2013, 06:33 AM
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For you, running regular, mid, or premium will all do the same thing for you. The only difference between the 3, besides the obvious octane rating, is the higher up you go in octane, the cooler and less resistant to knock the fuel is. It also burns a little slower (because of it burning cooler). If you want mid grade, get it. It won't be a MAJOR improvement, but it will give you a (not so noticeable) spunk in your car. I wouldn't recommend running premium as you don't need it. Your car isn't doing anything near what you would need to use premium .

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post #5 of 26 (permalink) Old 04-30-2013, 08:58 AM
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I run premium through mine every now and again for the hell of it, help clean the fuel system and injectors and whatnot. I also only use shell or bp gas, never any cheap watered down crap

As stated above though running premium isn't going to do much, but its only a few bucks more per tank. If you do it just run what's in if down to E before filling


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post #6 of 26 (permalink) Old 04-30-2013, 10:57 AM Thread Starter
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Would u recommend it?
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post #7 of 26 (permalink) Old 05-22-2013, 01:18 AM Thread Starter
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Si I got full exhaust.and im putting my new o2 sensor in today now I was gonna get regular gas but if putting in the new o2 should I get mid grade? I have 4/8th of a tank left with mid grade do any thing?
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post #8 of 26 (permalink) Old 05-22-2013, 07:22 AM
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I wouldn't bother man, its just a waste of money. I mean you can try it if you like, it'll only be a buck more or two for a full tank, but anything you feel will only be a placebo effect.

I mean my car they strongly recommend premium, but in the owners manual it says 89 will work but there may be a decrease in power, most of the guys on the ATS forum just put regular in as they cant be bothered to sped extra (cheap SOBS eh? )

Some people run Shell premium because they're the only brand (here anyways) that dont put any ethanol in the premo and some folks claim better mileage.

But unless you're TUNED for anything over regular its a waste of money.


Last edited by StevoElsupremo; 05-22-2013 at 07:25 AM.
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post #9 of 26 (permalink) Old 05-22-2013, 07:55 AM
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I run premium in everything, even if it's a beater.

It nets better MPG's, it keeps the gas tank/fuel system/lines/injectors cleaner, it BURNS cleaner as well, most of the time netting better co2's out the back, and you most of the time, get better performance. How much? Probably not anything you'll see...but something is better than nothing.

Also, the few more bucks at fill up for a cleaner, better gas is always a plus in my book. I strive to find non-ethanol additive gas...sure it costs more, but that's where the real MPG's and such are at. No mixed pumps...so you don't get a gallon~ of what the person before you used, which is why I always drove out of the way in my old cars to fill up at the 0% Ethanol, separate pump, 93 @ the BP a few miles from my place.

To me, it's worth it. Keeps the car in better condition...not to mention the overall lack of carbon build up over time that you would get with crappy low octane gas.

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post #10 of 26 (permalink) Old 05-22-2013, 09:17 AM
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well thats what I was saying about Shell ^ up here ALL stations have ethanol in ALL grades except shell.

Thats why some use shells premium here 0 ethanol content, I throw premium in my car because well, there is a noticeable decrease in power if I use regular, GM says up to 20HP.

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