well i've only used 87 since i've gotten the truck. i dont see a reason to put anything above since i run through it in a week. i'm not spending extra money on some gas that is states in the manual 87 and above will work. plus i have a warrenty so if anything screws up then dogde can fix it. i like the style of the truck, but have been displeased with the proformace of the truck. mine has been the shop 4 times in the past 2 months. the had to fix my doors (weren't aligned right), side mirror has already been replaced b/c of loud noise of the mirror (sounds like motor), & 2 times for the dying of my truck just sitting (replaced a senor in the gas pedal & flashed my computer the 2nd). my truck only had 9 miles on it when i got it in Nov. & its at 7,000 now.

 

You didn't read your manual thoroughly. 2005 states 87 octane. I find that Shell produces the best MPG .3-.5 mpg greater than other brands. Since all gas is $2.00 a gallon why would anyone not buy a brand?

 

i go onpost for my gas. so if they have bad gas guess who's paying for my car (government)?

 

LOL! The Gov't, be it Army, Air Force, Navy, or Marines prolly won't pay for jack, unless you've very very good lawyers that can dig up significant evidence that the gas damaged your vehicle, and even if they do, I doubt the government is gonna budge. In my experience, the government doesn't take well to demands regarding damage. Ever do a PCS move and stuff is broken? Even if they reimburse you for damages (I've had a case where they refused to pay for damages, claiming it was that way when they moved the item), they're never giving you what it was actually worth.

If there's a question about the quality of gas on-base, I'd rather get it off-base. In fact, I get my gas local (Leesburg, VA). My wife got her gas at Ft. Belvoir the other day and stated their 87oct gas was like $2.09/gal or something like that. I got Sunoco 87oct for $1.99/gal, so there is good, cheap gas (cheaper than gov't gas) to be found, depending on where you live.

 

don't know who you've dealt with, but you need to know where to go if you seem to have a problem with the gov. paying. they had a few months back where the onpost gas had alot of water or something in it, so they had to fix some cars & of course fix the problem. PCS moves we've had broken stuff, but the military has always paid. don't stop your complaints at one place, if need be go to IG. they take care of alot of things. i don't mess with little people if i feel they can't accomplish the problem i have, i go up.

 

Silver Eagle - I was taught in college that Heptane was the portion of galoline that made up the other % of octane; i.e. 87 octane was comprise of 87% iso-octane and heptane 13%. Since, as you say heptane has an octane rating of 0, it makes sense. I looked up heptane in the Shell Web page since a few guys were throwing that name around and here's what I found.


and from Chemical & Enigineering under Scinece and Technology

The C4-C8 straight-chain alkanes refered to above are heptanes. Here's the chemical make-up of normal heptane:

----H H H H H H H
----| | | | | | |
H -C-C- C-C-C- C- C- H
----| | | | | | |
----H H H H H H H



normal heptane


All the reading I've been doing suggests that n-heptane is still being used as the counter part to iso-octane as well as a bunch of other crap like for EPA standards in our major cities.

 

why does the dealership say not to use 91 octane?

 

I have a 2004 dodge ram 1500 slt 5.7l hemi .. they said not to and to use 89 and rarely 87 ... the compression is 9.6:1 stock .. why 89 and not 91?

 

cuz they're idiots and are just telling you whats in the manual. no joke, that's the real reason. it's not going to hurt you at all if you put in 91 instead of 89.

 

93 here all the time and I run either Sunoco or Chevron. I have the premium tune on my truck too.