Different gas mixes in different states. - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 16 Old 03-24-2015, 12:28 PM Thread Starter
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Different gas mixes in different states.

So i don't know what the difference is between summer/winter blends and the blends that may or may not be allowed in different states.

That being said, i just got back from a long road trip from Houston TX to W Yellowstone MO.

Once out of TX i noticed an increase in fuel economy. I was avg about 14-15mpg (freeway driving) all through TX. Once in NM, CO, UT, ID and MO i was avg 16.5-18mpg. It cratered again as soon as i filled up in Ft Stockton once back in TX. These avg are all hand calculated, the carputer was calling 21.5mpg at one point which i know wasn't true.

Another things, my CEL light kicked on in Cortez, CO (on the way out) and stayed on until we were in Gallup, NM on the way back home. I didn't get a chance to pull the codes, but i think it picked up on a misfire.

A note about my set up:

Lift: 3.5"
Tires: 315/75R16 (34.5")
Gears: 5.13

I think this thing is finally coming together. Still Needed: drive shafts, frame mount rails...then done son! For a while...
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post #2 of 16 Old 03-24-2015, 04:33 PM
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I've vacationed out west twice a year for the past five years and notice the same thing.

Elevation. While the engine may have less power at elevation, you're getting better gas mileage because the engine is producing less power.

I'm sure I will be corrected. It's what I've found.

Edit: I googled and found conflicting reasons. Here's one that goes with what I typed that I had read: http://www.ehow.com/about_6744997_ef...s-mileage.html

Last edited by Dollar; 03-24-2015 at 04:35 PM.
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post #3 of 16 Old 03-25-2015, 12:20 AM
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You have to watch your octane ratings as you go from place to place over a distance. Had a friend traveling with me to Moab pick up a tank of 85 octane in Utah. From St. George over the passes on I70 was not fun. He has a slide-in camper and was flat-towing his LJ and was having trouble doing 45 MPH at times. Truck started sputtering and acting like it had a clogged fuel filter when the engine was under load. He finally thought to check his owner's manual and sure enough the manual said not to use less than 87. Next fill-up everything went back to normal. I know that's not the same experience you had, but it's all related to the gas available in different states. It does vary.

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post #4 of 16 Old 03-25-2015, 02:36 AM
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The refineries change the composition of gas so it able to vaporize in colder temps in the winter but this process reduces the amount of energy in our gas. This is why fuel economy goes down in the winter. It's for our own good.

But the refineries use this to justify extra cost because they have switch from production of one gas type to another, they have to shutdown for maintenance in the spring, and every other excuse they can come up with to jack up gas prices. It just a big scam specially in California.
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post #5 of 16 Old 03-25-2015, 12:00 PM Thread Starter
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Quote:
Originally Posted by UnlimiDozer View Post
You have to watch your octane ratings as you go from place to place over a distance. Had a friend traveling with me to Moab pick up a tank of 85 octane in Utah. From St. George over the passes on I70 was not fun. He has a slide-in camper and was flat-towing his LJ and was having trouble doing 45 MPH at times. Truck started sputtering and acting like it had a clogged fuel filter when the engine was under load. He finally thought to check his owner's manual and sure enough the manual said not to use less than 87. Next fill-up everything went back to normal. I know that's not the same experience you had, but it's all related to the gas available in different states. It does vary.
Generally, regular in TX is 87, but i did notice that Reg in other places was 85. That may explain the slight missing at times, usually as i was just beginning to speed up.

I think this thing is finally coming together. Still Needed: drive shafts, frame mount rails...then done son! For a while...
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post #6 of 16 Old 03-25-2015, 12:37 PM
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Yeah our high altitude reg is 85 octane.

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post #7 of 16 Old 03-25-2015, 01:18 PM
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Regular is 87 in most of California, with 89 as mid-grade and 91 as super/supreme. There are a few gas stations that sell race fuel (100 octane) sprinkled around but since most of us don't run high-compression/turbos in our Jeeps - who cares?

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post #8 of 16 Old 03-26-2015, 04:47 AM
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Quick comment...
Regular = 87
Super = 91

Who The F**k uses "mid-grade" ??
You know what mid-grade is? A mix of Reg + Super...

And by the way, there is sometimes a little diesel in Regular gaz...
When they transport by pipeline, when they switch from transporting diesel to gaz (or the other way), they do not stop the pumps, they just switch from tank A to tank B...
So you get a few feets of mixed liquid in the pipe, called the buffer.
At the other end of the pipe this buffer mix goes in a side tank, and they mix it slowly in Regular gaz...
This way they do not lose a single drop...
They do not mix this krap in Super or in Diesel...
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post #9 of 16 Old 03-26-2015, 04:58 AM
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Montana is MT not MO.
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post #10 of 16 Old 03-26-2015, 12:19 PM
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I always use "regular" unleaded no matter where I am... With the ASSumption that it is equivalent to 87 octane at sea level. Never had an issue or noticed any significant loss of power or difference in gas mileage.

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post #11 of 16 Old 03-26-2015, 01:59 PM Thread Starter
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Quote:
Originally Posted by Jadmt View Post
Montana is MT not MO.
LOL! It didn't feel right when i was typing it. I'm sure the fine folks in Montana would be aghast to be called Missourians and the other way around.

I think this thing is finally coming together. Still Needed: drive shafts, frame mount rails...then done son! For a while...
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post #12 of 16 Old 03-26-2015, 08:36 PM
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The different gas formulations are for emissions. IIRC there's like 60+ different combinations varying sometimes county by county... There can be 2 or more formulations depending upon the governing body in 1 city or county.

Gas vaporizes at roughly 32 degrees F

lower octane burns quicker, higher slower

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post #13 of 16 Old 03-27-2015, 01:37 AM
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Quote:
Originally Posted by ockgator View Post
lower octane burns quicker, higher slower
Thus the knock from low octane gas -- also called pre-ignition.

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post #14 of 16 Old 03-27-2015, 06:08 AM
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MA/RI .. gas has too much ethanol, combine that with cold temperatures in the winter and gass mileage drops. Mobile/Shell midgrade is said to have less ethanol. I tried it. I get 1mpg more. it's more of a wash so it's not worth it for me. Not too concerned I didn't by my Wrangler for mpg. The Wife's car is for the mpg.. my wrangler is for fun and commuting to work three days/week (18 miles).

I stay away from Citgo, and Gulf. I run just Mobil/Shell regular unleaded.
Citgo/Gulf yields lower mpg. maybe their fuel has more ethanol.
Don't run Sunoco 85 octane either.

As everyone pointed out, there are a lot of factors for mpg.
elevation, air termprature, fuel formula, tire psi

When on the trails I drop 12 psi. When on sand I drop 20 psi.
When on pavement I run at 37 psi
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post #15 of 16 Old 03-27-2015, 09:19 AM
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I live in FL near the coast and have been using NON Ethanol gas. The old stuff. I have picked up 2-3MPG on average over 3 tanks. I am getting an additional 50ish miles per tank.

I am hoping the Proposed ban in Oregon and Colorado(I think) will start getting rid of this ethanol

Obama's EPA just shut down your favorite ORV trail.

Last edited by StepsRide; 03-27-2015 at 09:22 AM.
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post #16 of 16 Old 03-27-2015, 09:24 AM
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http://www.buyrealgas.com/#

This may help

Obama's EPA just shut down your favorite ORV trail.
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