GM Truck Club
THE PREMIER CHEVY TRUCK & SUV FORUM
Founded in 2004 ~ We're the #1 Chevy Truck & SUV Forum.
Silverado & Sierra | Tahoe & Yukon | Suburban & Yukon XL | SUV & CROSSOVER

Premium vs regular unleaded fuel.

Discussion in 'Chevy Truck Talk & GM News' started by stchman, Mar 11, 2013.

  1. PantheraUncia

    PantheraUncia New Member

    Joined:
    Dec 13, 2011
    Messages:
    1,032
    Likes Received:
    1

    http://pure-gas.org/

    - - - Updated - - -

    Yes you can quote me on that.:party:
    #21
  2. McClintoc

    McClintoc Super Moderator

    Joined:
    Aug 18, 2012
    Messages:
    1,575
    Likes Received:
    3
    Forget octane numbers. Give me back my ethanol-free gas!
    #22
  3. SurrealOne

    SurrealOne Former Member

    Joined:
    Aug 14, 2011
    Messages:
    10,778
    Likes Received:
    13
    That's pretty much where I am, too. :)
    #23
  4. RayVoy

    RayVoy Active Member

    Joined:
    Apr 18, 2012
    Messages:
    2,122
    Likes Received:
    5
    This is one of the times, I agree with [MENTION=57614]stchman[/MENTION] completely (there have been times our opinions have differed, his fault :rofl: ). All things being equal, regular gas is all that is needed in most of our trucks (high performance, tuned, not withstanding)

    In New Brunswick, the law only allows ethanol in the 87 gas, the high octane can not have ethanol added. This means, that 91 octane could, in theory, give you higher mpg, as the ethanol has lower BTUs than gas.

    I/we travel in these states a lot (in fact, I spent the weekend in Maine) every pump that I have used, states that there is 10% ethanol added.
    They probably do get the gas from Canada (I know Irving supplies a lot of New England), however, the mix is added at the fill station. Irving, and most other Canadian suppliers, mix according to the customers demands, so if customer wants 10% in all gas, the trucks deliver 10% to the customer's stations.
    #24
  5. Morpheus

    Morpheus New Member

    Joined:
    Feb 25, 2013
    Messages:
    27
    Likes Received:
    0
    I run Plus gasoline here because most of the station's regular gas is 86 Oct where the manf asks you run 87. Plus is 88, so there you go. Past that, I notice no difference between plus and premium, but I do actually notice a difference between regular and plus. That, and Walmart gas makes my truck hard to start. Weird, I know. I have to agree with the post I read up there regarding performance vehicles. If I'm running a high compression fully built motor, I'm running as high of octane I can and at the strip I'm running race gas. As far as my stock 5.3L is concerned, if it doesn't like 88 oct, it can get over it.
    #25
  6. SupplySgt

    SupplySgt New Member

    Joined:
    Feb 16, 2010
    Messages:
    764
    Likes Received:
    2
    I'm not getting into the "regular vs premium" debate. However, for those wanting to know where they can find ethanol-free gas, I'd like to post this link

    http://pure-gas.org/

    I almost always get gas at the local Co-op for the Camaro. I'm not as picky in the truck since it's my daily driver and it's EFI so it can handle it a little bit better. The 73 is carbed so I avoid the 10% ethanol if at all possible (albeit it's nearly impossible when I take it on a road trip)
    #26
  7. Pikey

    Pikey Moderator

    Joined:
    Nov 11, 2011
    Messages:
    4,232
    Likes Received:
    12
    Ethanol free fuel is widely available in Michigan. The issue is that most the time it is located it at a marina. They charge $2-$3 dollars more than "street price". I did notice that there is a gas station near my sisters home that sells it. I may take a drive by next time I am in the area and see how their prices look.

    - - - Updated - - -

    I have worked in a few gas stations in my lifetime. The plus is always the least purchased gas. People either buy the cheap stuff or the premium. We would have the regular and premium tanks filled 3-4 times before we had to have the plus tank filled. At two of the places I worked we received reports of vehicles running poorly after filling up with the plus grade fuel. After the owners of the stations spoke with the fuel supplier, they determined that the plus sat so long in our tank that it was no longer "fresh". I knew one of the customers that complained very well. He went back to regular and never had another issue.
    #27
  8. Morpheus

    Morpheus New Member

    Joined:
    Feb 25, 2013
    Messages:
    27
    Likes Received:
    0
    I can see how that would work. I haven't had an issue running Plus at all unless it's Walmart gas. It always struck me as odd that Walmart gas was the only one but if nobody buys plus then there you go. As far as cleaning out the fuel systems and stuff like that, they make fuel system cleaner and I do that every time I change my oil. I'd run regular if I could, but I'm not going to run lower octane than the manf is asking for. Plus is the logical choice to me for that reason only.
    #28
  9. tbplus10

    tbplus10 Moderator

    Joined:
    Mar 14, 2007
    Messages:
    5,405
    Likes Received:
    25
    Funny you should say that it is possible to run water injection and get some benefits but you have to be careful about how much spray you run so you dont increase the compression to much. My supercharged 99 Tacoma is running 3/4 gl water an hour along with methyl alcohol and regular unleaded premium doesnt seem to work as well with this mix. Ive got about 40k miles running this mix through Bosche injectors eith an added injector for WOT applications. Ive gotten a best of 502hp from a mostly stock 3.4 and improved mpg upto 23mpg running 35" tires.
    like a.few others have noted premium does more to inhibit knocking with new engines its more important since its not as easy as adjusting the spark like older engines.
    but unless you have a knock issue its taking money out of your pocket running premium.
    #29
  10. sierra11

    sierra11 New Member

    Joined:
    Jun 26, 2011
    Messages:
    161
    Likes Received:
    1
    I use pure gas as much as I can on my boat and then sometimes in my truck. What kills me is filling up my boat with that because it is usually 75 cents to a dollar more and when filling a 130 gallon tank it hurts. The boat runs so much better though
    #30
  11. RayVoy

    RayVoy Active Member

    Joined:
    Apr 18, 2012
    Messages:
    2,122
    Likes Received:
    5
    In New Brunswick, most stations stock only regular and premium (2 tanks), the middle grades are mixed by the pumps to provide the desired octane.

    We also have ethanol added to the regular and, by law, it can not be added to the premium. Therefore, the middle grades will always have a percentage of ethanol.
    #31
  12. JTward1

    JTward1 New Member

    Joined:
    Nov 9, 2012
    Messages:
    39
    Likes Received:
    0
    Well your right, I have a supercharged 2007 Pontiac Grand Prix GT and it has a Eaton M90 self lubricating supercharger and it stipulates that the engine be run on a minimum of 91 octane and absolutely no more than 10% ethanol. And I have a 2003 Corvette with the LS1 engine and it too, stipulates that the fuel also be a minimum of 91 octane. It does state in both owners manuals that ' if ' 91 isn't available, in a pinch use regular 87 octane, but once you can refuel, use 91 octane. The only thing that separates 93 octane and regular 87 octane is two fold, the higher octane has a much better additives package, and two it's cleaner. In New Jersey last year, the state did a survey of twenty independent owned gas stations checking not for accuracy of dispensed amount, but for quality. Of the twenty 14 were selling regular 87 for 93 octane. and for regular 87 they were selling regular fuel that had a octane rating of under 94 octane. So go figure on what you put in your gas tank. The best thing you can do for your vehicle is use a 'Top Tier' Gasoline. All top tier fuels meet current engineering standards. go to www.toptiergas.com for the list of the fuels included.
    Last edited: Mar 22, 2013
    #32
  13. Crispyt

    Crispyt New Member

    Joined:
    Apr 12, 2011
    Messages:
    188
    Likes Received:
    1
    Higher octane fuel doesn't really give you more horsepower, it gives you more torque because a higher octane fuel burns slightly slower so you get a longer power stroke which gives you more torque. In comparison to diesel engines, one of the reasons why a diesel engine makes less horsepower and more torque is because diesel fuel burns a lot slower than gasoline does, making a diesel power stroke a lot longer because you have a longer burning flame to push the piston down.
    #33
  14. JTward1

    JTward1 New Member

    Joined:
    Nov 9, 2012
    Messages:
    39
    Likes Received:
    0
    Absolutely correct ! In the coming years, (Mark my words) the biggest impediment to engines, both domestic and foreign is going to be "Quality" not "Quantity". Already I read that the EPA is going forward with E-15 at every street gasoline. Well besides the highly corrosive nature of ethanol, the gasoline is going to bring performance down. 93 Octane is only useful in higher compression engines of which many domestic and overseas auto manufactures depend on. Audi, MB and BMW have already issued a statement that if E-15 is used in their preset cars, your warranty is void after the damage is done. So go figure. A friend of mine comes from Ecuador and he has told me that the majority of the cars and trucks are Japanese and come with Stainless steel fuel systems as they only have, or the most used gasoline is 87 octane E-85 in South America. But they have thousands of acres of sugar cane to be refines into E-85, The mileage is terrible but the gasoline is cheap.
    #34
  15. stchman

    stchman New Member

    Joined:
    Oct 31, 2012
    Messages:
    1,035
    Likes Received:
    1
    The thing that gets me is that pretty much every car on the road runs without issue on E-10. Would 5% more ethanol be that damaging? I find it difficult to believe.

    Will Audi and BMW stop selling cars in the US if E-15 becomes fairly widespread? NO.
    #35
  16. JTward1

    JTward1 New Member

    Joined:
    Nov 9, 2012
    Messages:
    39
    Likes Received:
    0
    Well that would depend, How many times have you fueled up your truck ? Now consider how 50% more ethanol is in it. Ethanol will give you higher octane, yes, but it burns at a lower temperature, thus your mileage goes down. It's the nature of the fuel. Ethanol is an oxygenate and it mixes more air into the fuel, but that oxygen has a lot more water in it. But water and gasoline don't mix. So, say you fuel up and take off, . . the engines going to run great, but since water/ethanol is heaver than oil it sinks to the bottom of your gas tank and once it's burned off the engine starts to run on the petroleum part of your fuel. Now I'll bet you'll never notice the switch, . . . But your engine sure as heck will. Ethanol/water now sits over night day in day out, and all those tiny little metal parts in your fuel pump and in the gauge and fuel injectors start to degrade. Over time you'll develop fuel system problems. It depends on how long you keep your vehicle. But sometime, somewhere, someone is going to fall pray to the corrosive effects of Ethanol. Go to any auto parts store or even Home Depot, they sell little bottles of something that's suppose to "Clean out your fuel tanks that are effected by ethanol" Just read the label one time ! If your lawn equipment is effected by ethanol, what do you think is going on down in your trucks fuel tanks ? The lunacy of this thinking is the EPA last year came to an agreement with the three biggest auto makers that all vehicles reach a overall MPG of 54 MPG by 2020 or 2024 , I forget which. Now they clearly did this despite the fact that they even know themselves that the more ethanol in your gas tank, the worse off your MPG is going to get. So I don't know . . . go figure. I don't know why the folks inside the Washington beltway do what they do, when they do it. Try calling your local Congressmen or Senator. See if you can even talk to them, it ain't going to happen. These guys don't even know your there. And you trucks engine, well So. . .
    #36
  17. stchman

    stchman New Member

    Joined:
    Oct 31, 2012
    Messages:
    1,035
    Likes Received:
    1
    If E-15 is so horrid, what would E-85 do?
    #37
  18. JTward1

    JTward1 New Member

    Joined:
    Nov 9, 2012
    Messages:
    39
    Likes Received:
    0
    Well, I'm sure you've seen a Chevy Tahoe or two with that cute little badge on it butt, "Flex-Fuel" That's the version with a stainless steel fuel system. If E-85 come into being, it'll take a few car engine fire for the government to adjust their thinking. But I think I can assure you Washington could care less if your ride goes up in flames, It's for the 'greater good' Just like "Cash for Clunkers" was. Boy there was a real smart program ????????
    #38
  19. stchman

    stchman New Member

    Joined:
    Oct 31, 2012
    Messages:
    1,035
    Likes Received:
    1
    My 2013 has a sticker on the side window that says it's flex fuel capable, also has the yellow fuel cap.

    Anytime you get the feds involved in "regulating" something, they usually screw it up or it make things cost more.
    #39
  20. JTward1

    JTward1 New Member

    Joined:
    Nov 9, 2012
    Messages:
    39
    Likes Received:
    0
    Yes, The 18 amendment proved without a doubt how only elected idiots in Washington, whom can take the most accepted concept and destroy it. Of course they seek salvation by issuing the 22 amendment. Close to a hundred years later, here we are with flex fuel and the corner gas station offerings.
    #40

Share This Page