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Unread 03-01-2014, 01:24 PM   #1
Eckoh
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Simple request for you TJ guys regarding gas mileage

Not 100% sure if this is the right place but i'll post it here

We all know TJs do not get great mileage. However i have found reports that gas with ethanol added will not "agree" as well with the 4.0 engine. So if some of you could just use a few tanks of gas with ethanol and a few without and compare the mileage we might able able to find out if there is any truth to it.

http://pure-gas.org has a listing of gas station that have ethanol free pumps, its not 100% accurate so you might have to double check yourself to see if it is ethanol free.


Please help me figure out if there is any truth to this is emperical date from a number of sources rather then just hearsay.

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Unread 03-01-2014, 01:39 PM   #2
hokahay
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Like this?

date gal price cost odometer miles mpg
11/03/12 14.82 3.3189 $49.18 87606 210 14.17
11/17/12 14.82 3.9816 $59.00 87827 221 14.91 rec fuel
12/01/12 13.27 4.0692 $53.99 88038 211 15.90 rec fuel
12/15/12 14.72 3.2588 $47.96 88279 241 16.38
12/29/12 15.17 3.9788 $60.37 88505 226 14.89 rec fuel
01/15/13 15.01 3.3889 $50.85 88756 251 16.73
01/28/13 14.6 3.4189 $49.93 88983 227 15.54
02/15/13 14.72 3.7392 $55.03 89203 220 14.95
02/24/13 14.82 4.4692 $66.22 89410 207 13.97 rec fuel
03/14/13 14.4 3.7410 $53.87 89632 222 15.42
03/30/13 15.12 4.3693 $66.05 89845 213 14.09 rec fuel
04/12/13 13.4 3.5385 $47.43 90064 219 16.34

This is a log of fill ups and the type of gas either 87 ethanol or rec fuel. The resulting mileage for the fuel type shows in the next fill up.
I think it is obvious from this data that there is more energy per unit volume in the rec fuel.
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Unread 03-01-2014, 01:47 PM   #3
Eckoh
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yeah that kind of data

It looks like more then a 1 MPG increase with the non ethanol fuel. That is just one source of data as well
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Unread 03-01-2014, 01:53 PM   #4
hokahay
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Originally Posted by Eckoh View Post
yeah that kind of data

It looks like more then a 1 MPG increase with the non ethanol fuel. That is just one source of data as well

While the MPGs were better the Miles/$ were worse lol. I also wonder about engine life between the two fuels while you are at it.
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Unread 03-01-2014, 03:30 PM   #5
Eckoh
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Originally Posted by hokahay View Post
While the MPGs were better the Miles/$ were worse lol. I also wonder about engine life between the two fuels while you are at it.
prices vairy place to place, where i am the prices are the same just the "brand" is different.
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Unread 03-01-2014, 03:56 PM   #6
JealousDad
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I must be reading it wrong. It looks like your worst mileage (13.97) was on the rec fuel and the best (16.73) was on the ethanol fuel. And the rest of them aren't that far apart.
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Unread 03-01-2014, 04:10 PM   #7
Dave02TJ
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Quote:
Originally Posted by hokahay View Post
While the MPGs were better the Miles/$ were worse lol. I also wonder about engine life between the two fuels while you are at it.
In Illinois we don't have the option to buy non ethanol fuel. E10 was here in 80's and has been ever since. I should say that yes, you could buy racing fuel at some obscure station at an outrageous price that wouldn't have ethanol.

Anyways...The engine life seems to be fine, 200,000 miles is obtainable on many vehicles and could be surpassed.

Rust is the bigger worry here.
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Unread 03-01-2014, 04:11 PM   #8
hokahay
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Originally Posted by JealousDad View Post
I must be reading it wrong. It looks like your worst mileage (13.97) was on the rec fuel and the best (16.73) was on the ethanol fuel. And the rest of them aren't that far apart.
The line that is marked rec fuel is the kind of fuel purchased that day. The mileage for that purchase shows at the next fill up. That is the next line.

Quote:
Originally Posted by Eckoh View Post
prices vairy place to place, where i am the prices are the same just the "brand" is different.
Where I am the price for 'real gas' is much higher that for the ethanol blend. If it was the same I'd never buy ethanol. The pump is labeled "for recreational use only' but I figure if my TJ isn't recreation what the hell is! Sure as heck isn't my lawn mower.
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Unread 03-01-2014, 04:11 PM   #9
Dave02TJ
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Quote:
Originally Posted by JealousDad View Post
I must be reading it wrong. It looks like your worst mileage (13.97) was on the rec fuel and the best (16.73) was on the ethanol fuel. And the rest of them aren't that far apart.
The fuel burned after the REC fill up is the non ethanol. So when you see REC the mileage of that fuel is calculated at the next fill.
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Unread 03-01-2014, 04:19 PM   #10
hokahay
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Originally Posted by Dave02TJ View Post
The fuel burned after the REC fill up is the non ethanol. So when you see REC the mileage of that fuel is calculated at the next fill.
Correct. I have kept a record of every single tank like that since I bought the jeep in September 2004. 390 fill ups. 4911.966 gallons. $14306.14 and 77,435 miles. 15.76 mpg. $2.91/gal.

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Unread 03-01-2014, 04:23 PM   #11
Dave02TJ
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Holy cow, I'm glad I didn't keep records! I calculate the MPG's at fill up but don't keep records. HOLY COW $14,306.
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Unread 03-01-2014, 04:28 PM   #12
JBTJ
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Quote:
Originally Posted by hokahay View Post
Correct. I have kept a record of every single tank like that since I bought the jeep in September 2004. 390 fill ups. 4911.966 gallons. $14306.14 and 77,435 miles. 15.76 mpg. $2.91/gal.

I checked my MPG's once that was 148K/13 years ago.
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Unread 03-01-2014, 04:30 PM   #13
hokahay
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I checked my MPG's once that was 148K/13 years ago.
I am obviously a glutton for punishment. I am also a software engineer. But then I repeat myself.
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Unread 03-01-2014, 04:38 PM   #14
glwood6
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Non-ethanol in my city is only available at one station I have found. They usually only have it available in the mid-grade octane, and it is about 50 cents more per gallon than regular around here. I have tried a couple of tankfuls, but have not seen a noticeable improvement in mpg.
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Unread 03-01-2014, 05:02 PM   #15
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Ethanol has less energy chemically per volume than gasoline. Science.
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