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What grade of gas do you run in your chevy?

Discussion in 'Chevy Truck Talk & GM News' started by repley81, Apr 24, 2013.

  1. repley81

    repley81 New Member

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    Like the question asks, what grade do you use and why.

    I use premium. Figured a premium truck needs premium gas lol
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  2. McClintoc

    McClintoc Super Moderator

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    A constantly revolcing debate...

    I run 87 Octane. The basic, recommend for my truck. It's by no mean "high performance" so it doesn't need high-octane gas.
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  3. stchman

    stchman New Member

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    Read your owners manual and you will discover what fuel you need to run.

    Run whatever the owners manual states the engine needs. You have a Sierra Denali, they only come with the 6.2L engine and therefore you MUST run at least 91 octane or better.

    It's not that it's a "premium" truck, just that the 6.2L engine reguires higher octane fuel.

    My 5.3L engine requires 87 or better octane. Running 93 gives you nothing other than spending more at the pump. I don't care what someone's uncle, niece, grandfather, etc. says. Premium does not contain magic stuff to transform an engine that requires 87 octane into a 500HP beast. Also, if you require 87 octane, running 93 will NOT give you better fuel economy, no matter what Billy Bob says.
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  4. TimTom64b

    TimTom64b New Member

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    I run premium... I have a performance tune that requires 92 or better octane.
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  5. seph

    seph New Member

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    This is one I've seen a number of folks have pretty strong attitudes about and have never known anyone to change their minds much. I know a few people who really focus on grades and or brands of gas, with many others who are the opposite. Its like most things...its what ever you are most comfortable with and what seems to get the results you are looking for in your trucks.

    Gas is something I'm pretty finicky about. I worked at then ran a Sohio station for years which was owned by a small Chevrolet dealer which gave me some unique (though a bit outdated) views on both sides. The manuals do give the suggested level of gas, but that is the minimum the car will properly run on. Whether or not a higher grade will produce higher mileage is something you have to check for your self. Some cars do...others don't.

    With the exception of my kids cars (old, high mileage, and hand-me-downs) I run premium in all my vehicles. Its not so much for any higher mileage, even though a few of my cars do get a small bump of 2-3mpg with it, as it is for the added cleaners and what not. On top of the grade of gas, I also try to use specific brands so the blends are fairly consistent. My #1 is Shell, #2 is BP, #3 is Sunoco...past that its almost always going to be I'm in the middle of nowhere and need something or I'll be walking. :money:
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  6. Pikey

    Pikey Moderator

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    I run regular. I have run premium in the past because a friend insisted that it gives better fuel economy. I did notice a slight increase in mpg. 1mpg. Not worth it in my opinion. When I worked in the garage I noticed that the mid grade was the tank that never had to be filled. Maybe once for every five the other two were filled. No one ever bought it. It was either premium or regular that was purchased. So, I will never run midgrade as I like to call it "old gas" that has sat in the tank forever.
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  7. SurrealOne

    SurrealOne Former Member

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    I run a custom Diablew tune that is tweaked to maximize mpg on 87 octane, so that's what I run. I buy 87 octane pure gasoline (as opposed "ethanol-enriched" gasoline that contains "up to 10% ethanol") any time I can get it ... and am of the opinion that THAT (pure gasoline instead of 'ethanol-enriched' gasoline) makes a more substantive difference than gas grade, these days.
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  8. RayVoy

    RayVoy Active Member

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    Just to toss a little real world into the debate, and to respond to a "gas grade" thread from a while back, I tried the following last weekend. 400 miles each way. Started with a full tank, reset and used the DIC.

    The "away" direction, I started with a near empty tank and filled with 91 octane My truck generally gives pretty good gas mileage, however, this tank averaged only 17.8 mpg.

    The "return" trip (same 400 miles), I filled with 87 octane and reset the DIC. For this trip, the truck gave me 20.3 mpg.

    Same roads, started at sea level, drove to sea level, returned to the starting sea level. The weather was the same, the time of day was the same. I drove the entire time, and I drove the same speed (70 to 75 mph).

    Of course, I did not fill at the same pumps, that and the octane were the only differences.
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  9. LBAR1

    LBAR1 New Member

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    Using the Regular 87 octane since my custom DiabLew tune is set up for it and the truck is my DD.
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  10. SurrealOne

    SurrealOne Former Member

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    Not necessarily true. Wind makes a huge difference when you are driving something with the aerodynamic properties of a cinder block, like like our trucks ... and you didn't mention wind direction or speed in either case.

    I've actually noticed substantive (1-3) mpg losses in 20-40 mph winds when I'm running against them. So, you'd really need to repeat that round trip (using the same fill-up points on each end, same driving techniques, same traffic conditions, etc.) multiple times. Once done, average across it and toss out any obvious outliers to get a solid feel for what could be expected in the real world.

    Why? Your one round-trip run might, itself, be an outlier...
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  11. sierra11

    sierra11 New Member

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    I switched to 89 pure gas about 2 months ago and I can definitely feel and difference. I don't think there was much of an mpg increase but the engine runs "stronger" and smoother. I won't be going back. I do the same with my boat only pure gas goes in it.
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  12. PantheraUncia

    PantheraUncia New Member

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    I dropped regular gas and moved to JP-7 for my engine. JP-7 burns hotter, cleaner and gives me better mileage.
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  13. TimTom64b

    TimTom64b New Member

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    just a tidbit of information on octane ratings.... octane ratings are deceiving. the higher the octane rating of fuel... the lower evaporative properties of the fuel. This is to decrease the chance of predetination of fuel in high compression/performance engines... due to higher heat etc. during compression cycle which can ignite the fuel prematurely causing engine knock... and possible engine damage. Its also advantageous to use higher octane fuel when pulling heavy loads... :)))
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  14. RayVoy

    RayVoy Active Member

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    Good point, the wind is a big factor. The other thing that I can not control, at this time of the year, is winter/summer blends and the amount of alcohol in the gas.

    I agree completely. sometimes moving up a little will smooth a rough running engine. The problem is usually spark knock and the PCM adjusting the spark to try and stop the knocking.

    Most times, this can be fixed by using a different fuel brand and staying at 87.
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  15. stchman

    stchman New Member

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    You are wasting your money on running premium in a regular unleaded engine.

    Agree, gasoline contains more energy than alcohol. My problem is there are no ethanol free service stations around my area, and the ones that are only use premium unleaded.

    That is in your head. People feel the need to justify their additional expense and their mind fabricates things. Sorry if I offended you, but a friend of mine is a psychologist.
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  16. TimTom64b

    TimTom64b New Member

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    How do you know he is not gaining any benefit? Maybe his engine is in need of a tune up... timing may be advanced or even carbon build up (older engine) causing predetonation or other issue the 89 octane fuel is compensating for. Sorry but it annoys me when people just throw your wasting you money on other fuel grades when their are circumstances when people will benefit.
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  17. blackburb

    blackburb New Member

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    I agree 100%. I run ethanol free as much as I can in every ice I own. Regular or premium, I don't care. I'll pay the "premium" price to get the ethanol free. Great website on ethanol free stations: http://pure-gas.org/

    I also run this "additive": http://www.ls1.com/forums/f48/been-testing-oil-91206/
    #17
  18. RayVoy

    RayVoy Active Member

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  19. blackburb

    blackburb New Member

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    There's no data to support the dozens of additives on the shelves of the parts stores either and they're a hell of lot more expensive. FTC sued Zmax over 10 years ago for claims they couldn't substantiate. They still got Carroll Shelby to pitch their crap. Lost all respect for the man when he did that.
    #19
  20. RayVoy

    RayVoy Active Member

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    You sound like your agreeing with me, yet you use an unproven "additive"

    The refiners could produce gasoline with a little more "oil" (heavy distillates). The gasoline of old is refined to remove all lower scale products. This is a more expensive process. Yes, it is done to meet EPA requirements, but it must also meet engine specs.
    #20

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