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Best Gas and Octane


Old 09-26-2008, 01:13 PM
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Default Best Gas and Octane

Currently I am using Shell fuel and 87 octane. I use Shell because I get a 3%discount on my gas purchases, but could get a gas card from any brand and probably get cash back. I have been reading that Chevron is better gas. I have also read that using higher octane increased fuel mileage and you even though you pay more for it, with the increased mileage you are actually money ahead. Anyone have any thoughts on this?
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Old 09-26-2008, 01:33 PM
rango1500 is offline
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in the manual for my 05 1500 it says to use 89 octane. i used to get gas from anywhere, now I only buy gas from BP (b/c of the 5% cash back). I have noticed i get 20 miles per tank more with the BP vs when i used to buy it from anywhere.
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Old 09-26-2008, 03:03 PM
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it is my belief that you should always purchase from the same supplier. your truck adjusts to things, including gasoline.

mind you some suppliers get gas from anywhere they can, but shell, bp, exxon, all supply their own gas.

i use 87 octane on my hemi with no problems at all. The only thing higher octane does for you is knock prevention. unless you are loading heavily, towing, driving really hard, or have a programmer or chip that advances timing as far as possible, i don't think there is a benefit to 89, and especially not to higher octanes.

i use bp cuz i get 5% back too, but if i had a shell card that did the same, i'd use shell.
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Old 09-26-2008, 03:15 PM
hemi head
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I don't have personal experience but a lot owner's are getting better MPG with 89 octane. If the gas you are buying now has 10% ethanol added you are getting at least 89 octane out of the 87 pump because the added ethanol raises the octane.Keep in mind that ethanol added gas get's less MPG's than conventional gas...Seems like everybody get's a differerent result,so personal experiments will probably net you the best result.
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Old 09-26-2008, 03:36 PM
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i run 91 octane exclusively now after doin some power comparisons. currently i dont have a programmer but after running tanks of both ive noticed a big difference between 87 and 91 in power. also shell seems to run the hemi better than most of the other brands, as well as the proven mpg gains of 91 over 87. plus the difference in cost between the 2 is 4-5 dollars /fillup. there is more to the higher grades than just knock elimination, as stated by others, more power, and mpg increase offset the cost difference. if i didnt notice any difference between the 2 i would run 87, but i dont.
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Old 09-26-2008, 04:01 PM
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the only dependable way to find out before hand
if a particular gasoline will give better MPG
is to send it to a laboratory and have the BTU per gallon checked,
which at retail costs about $105 at CT&E

a fairly dependable trick you can do yourself cheaply
is to weigh the gasoline
and determine the exact pounds in an exact gallon
to get the density.
most of the time more density means more BTU per gallon

avoiding 10% ethanol blend gasoline
using improves MPG by about 3%

more info got with your tax dollars here:

notice that when you fill with gasoline you can randomly get anywhere from
108,500 to 117,000

would you be happy if
when you bought a case of beer
sometimes there were 22 cans
and other times 26 cans ?

this also means if you are trying to test
whether some mod improves MPG
the change in gasoline can easily lead you astray
.... and so can changes in wind
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Old 09-26-2008, 04:15 PM
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I use the recommended 89 octane. It seems to get a little better mpg than 87.
I use Texaco or BP.
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Old 09-26-2008, 08:59 PM
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I use 87 and synthetic TC-W3 2 stroke oil...runs great and good mpg.
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Old 09-27-2008, 12:41 AM
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I have been using a higher quality gas , from Petro Canada (retailer that operates a refinery). 87 works fine, no knock.
I just read manual, says "satisfactory fuel economy and performance when using high-quality unleaded gasoline having an octane range of 87 to 89. The manufacturer recommends the use of 89 octane for optimum performance. Time to try 89.
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Old 09-27-2008, 06:19 AM
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I use 87, and it works fine. As for what brand I use - the cheapest I can find!
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