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Old 04-06-2013, 11:33 AM   #1
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Experiments with MPG in 2012 Unlimited Sport

Hi folks first post.....
I'm a rural mail carrier in North Idaho and my jeep payment and fuel by far my biggest expense. I am always looking for ways to save on fuel cost. I've learned a lot about what affects my fuel mileage through trial and error. Figured some of the things I've learned along the way could help the community. I've logged close to 30,000 miles since new, 3/4 of these on my route. The rest mixed city/hwy.

I drive a 2012 sport unlimited rhd 3.73 auto, purchased new in June 2012. I alternate between 3 sets of tires - stock 18" Sahara takoffs (32ish") and another set of 18" Sahara rims with 33" Duratracs for summer and stock 16" with 215/85/16 studded 30" Duratracs for winter.

Many have mentioned driving habits-for me this has been very key. My mileage has improved at least 2 mpg average simply from becoming familiar with my route . My route is very curvy with some hills and appx. 1/3 highway, 2/3 dirt and chipseal county roads. At first while learning the route, I routinely accelerated and braked much harder. Now after being able to anticipate each curve and mailbox before I can even see it around the next curve makes a huge difference. My wife has been trained on my route as well as a sub and tho she typically is a slower more cautious driver she gets at least 1 mpg less the me on the same route in the same jeep. I've noticed that seemingly small things that change the mpg very little on our family car ('01 Toyota Sequoia) very .5 mpg or less can make as much as 2-3 mpg difference on the jeep. I suspect this is from sensitivity of the ECM/VVT to fuel differences, wind resistance, tire size/pressure and and driving habits.

All mpg hand calculated with % tire size over stock added in when applicable. Also double-checked based on my documented line of travel mileage which doesn't vary.

Things I've changed from stock between 2k-10k miles, all documented on my route in 2wd unless noted differently......

1. Schaeffer's synthetic fluid with moly in both axles and engine. Royal purple synthetic in trans -- (+ 0.5 mpg)
2. Unichip tuner -- (87 oct and tune + 1 mpg) (92 oct and tune + 2 mpg)
3. AFE Pro 7 AF in stock box -- (no difference)
4. 33" Load Range E Duratracs -- (+ 1.5 mpg)



Misc Notes and experiments with additives..........

1. Cold weather (used block heater in mornings) and winter fuel vs. warm weather and summer fuel-- (-2 mpg )
2. 4x4 -- (-1-2 mpg)
3. Schaeffers fuel treatment -- ( no change)
4. 10% Diesel fuel w/92 octane gas and no tuner -- ( + 1 mpg) but it pings and the cost outweighs the benefits by far
5. Always fill tank completely by topping off until I see fuel sloshing up to the filler. I have found out that different pumps at the same gas station will "click" off at different points. One I found clicked off when there was still at least a gallon short of full. This will show an inflated mileage of up to 2 mpg depending on the miles ran. I wonder if this isn't a factor when some report the really high numbers?
6. This jeep really shines with the combination of the 3.73 gearing, and 33" load range E tires as long as I stay below 70 mph.

Best route mpg achieved in stock trim w/conventional fluids and tires (225/75/16) 29" tire in 2wd was
- 16.5 mpg @ 35-55 mph.

Best highway mpg achieved in stock trim w/conventional fluids and tires (225/75/16) 29" tire in 2wd was
- 19 mpg. 55-70 mph.

Best route mpg was achieved August 2012 with the addition of all synthetic fluids, 2wd w/Unichip tuner on 92 octane setting, 92 octane fuel, 33" Duratracs @ 36 psi. Ambient outside temp at 85 degrees, summer fuel, fresh wax no wind and light mail load.
- 21.7 mpg @ 35-55 mph.

Worst route mpg was achieved December 2012 with the addition of all synthetic fluids, Unichip tuner on 87 octane setting, 87 octane fuel, 30" studded Duratracs @ 36 psi. Ambient outside temp at 20 degrees, winter fuel. Snow pack on hwy and 14" of powder on side roads. All of route run in 4wd with heavy mail load.
- 14.3 mpg @ 35-55 mph.

Best Highway mpg was achieved September 2012 with the addition of all synthetic fluids, 2wd w/Unichip tuner on 92 octane setting, 92 octane fuel, 33" Duratracs @ 36 psi. Ambient outside temp at 75 degrees, summer fuel and 1 passenger and all our hunting gear.
- 22.8 mpg @ 55-70mph.



Current experiment EFT additive........inconclusive, only on 3rd tank and need appx. 6 tanks to determine full effect per their website. Must improve mileage by 1 to break even on cost. So far first tank at double dose as recomended +2.5. Second tank double dose +1.5. Will try to update if anyone is interested.



Feel free to comment, add your experiments/tips and ask questions. I've learned a lot from this board just reading for the last 6 months and would like to give back in any way I can.

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Old 04-06-2013, 11:47 AM   #2
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Off-topic, but mind if I ask where your route is? I live in Spokane and LOVE north Idaho. I spend a lot of time in Avery, St. Maries, Wallace areas, basically hanging out on the Joe. Love, love, love it and can't wait for the forest roads to start opening up.

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Old 04-06-2013, 11:50 AM   #3
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Great info.

How do you calculate for mpg and bigger tires? What's the frequency Kenneth?
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Old 04-06-2013, 02:43 PM   #4
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Quote:
Originally Posted by i82much View Post
Off-topic, but mind if I ask where your route is? I live in Spokane and LOVE north Idaho. I spend a lot of time in Avery, St. Maries, Wallace areas, basically hanging out on the Joe. Love, love, love it and can't wait for the forest roads to start opening up.
From the P.O. in Bonners Ferry north on Hwy 95 to Porthill at the Canadian border then back on the west side of the Kootenai valley to Bonners Ferry. Very scenic and in the sticks, hehe.

p.s. - I lived in Spokane for 2 weeks in May 2008. Had an apartment in the Sacred Heart Medical Center. Messed up a street bike and my whole left side when a good size bird smashed my helmet visor and caused me to take sharp dive over a 40' embankment.
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Old 04-06-2013, 02:45 PM   #5
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Great info.

How do you calculate for mpg and bigger tires? What's the frequency Kenneth?
I use this site Tire Size Calculator - Tire & Wheel Plus Sizing
I'm sure there are others but I like the ability to compare several sizes at once when choosing tire/rim combos.
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Old 04-06-2013, 02:55 PM   #6
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Quote:
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I use this site Tire Size Calculator - Tire & Wheel Plus Sizing
I'm sure there are others but I like the ability to compare several sizes at once when choosing tire/rim combos.
Thank you sir
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Old 04-06-2013, 04:38 PM   #7
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You put 10% diesel in your tank??? You may want to keep an eye on your cat convertor, not a good idea. No wonder it was pinging.
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Old 04-06-2013, 05:09 PM   #8
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Quote:
Originally Posted by TiggerRC View Post
From the P.O. in Bonners Ferry north on Hwy 95 to Porthill at the Canadian border then back on the west side of the Kootenai valley to Bonners Ferry. Very scenic and in the sticks, hehe.

p.s. - I lived in Spokane for 2 weeks in May 2008. Had an apartment in the Sacred Heart Medical Center. Messed up a street bike and my whole left side when a good size bird smashed my helmet visor and caused me to take sharp dive over a 40' embankment.
Beautiful country, I am jealous that is your daily routine! For me I don't get out in the country often enough. Still, it is so incredible to take a drive on a nice day in north Idaho with the freedom panels out. Going to try doors off this summer, if you see a commando green JKU coming at you with WA plates, wave hi
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Old 04-06-2013, 06:14 PM   #9
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You put 10% diesel in your tank??? You may want to keep an eye on your cat convertor, not a good idea. No wonder it was pinging.
Lol.....yah bad idea, in our rides at least. I got the idea from some fuel mileage forum. One guy has a newer 6.0 gas chevy van that he claims to have put 100k miles on with 30% diesel and 87 octane no problems and good fuel savings.
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Old 04-06-2013, 06:16 PM   #10
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Beautiful country, I am jealous that is your daily routine! For me I don't get out in the country often enough. Still, it is so incredible to take a drive on a nice day in north Idaho with the freedom panels out. Going to try doors off this summer, if you see a commando green JKU coming at you with WA plates, wave hi
You got that right......I love the country here. Will do.....I wave at most of the jeeps I see unless I'm distracted by a mailbox. Its hilarious how often I get a double take from oncoming traffic sitting on the wrong side.
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Old 04-07-2013, 06:09 AM   #11
Really liking the Jeep...

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You have to admit that at the end of the day owning a Jeep and being able to do Jeep things is completely worth the price you're paying for admission.

Being a mail carrier and doing that in a Jeep...maybe it's because I grew up having a Jeep-driving mail carrier myself, but that just seems so...awesomely American.

Best Regards!
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Old 04-07-2013, 09:43 AM   #12
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You have to admit that at the end of the day owning a Jeep and being able to do Jeep things is completely worth the price you're paying for admission.

Being a mail carrier and doing that in a Jeep...maybe it's because I grew up having a Jeep-driving mail carrier myself, but that just seems so...awesomely American.

Best Regards!
I know what you mean and I do really love my job and my jeep. Its a bit bittersweet though in a way. Bitter - it limits the mods and the money spent on them........no big bumpers, no lift etc. Sweet - it limits the mods and the money spent on them.
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Old 04-07-2013, 09:49 AM   #13
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Does anyone have knowledge or experience with HH0 kits on our rides such as this? These are sold by a family run business out of TN. They state around 30% fuel savings are normal for most vehicles. They've been building/selling these for 4 years and have a 99.9% feedback rating on ebay. Money back guarantee as well if they aren't able to help you get good results. That kind of feedback coupled with almost 3000 feedbacks has me very interested.

HHO Dry Cell Kit Hydrogen Generator Fuel Economy MPG Browns Gas Electrolyzer | eBay
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Old 04-07-2013, 10:05 AM   #14
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interesting

After reading a few threads about MPG and rear brake pad wear on the wranglers, I had a thought. Most traction control systems use the brakes to help control the vehicle, so I wonder if turning the system off would make a difference in the MPG & brake pad wear.

Have you tried that or would you be willing to, to see if it makes a difference?
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Old 04-07-2013, 10:09 AM   #15
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Look up hydrogen fuel enhancement on the internet. AAA says they don't work. Canadian government tested them and said they don't work. EPA says they usually modify emissions and violate federal law. Until reputable groups do scientific testing, not someone calculating mileage under variable conditions, save your money.
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Old 04-07-2013, 10:53 AM   #16
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thank you - this was interesting to read. I drive my JK for work (about 24K per year, lots of highway) and anyway I can earn a few MPGs when I'm doing that is helpful.
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Old 04-07-2013, 01:18 PM   #17
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No the HHO things don't generate enough hydrogen to be of any benefit. Remember e at feedback a are usually given on the very front end of the deal and rarely after thousands of miles of product use.
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Old 04-07-2013, 02:53 PM   #18
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interesting

After reading a few threads about MPG and rear brake pad wear on the wranglers, I had a thought. Most traction control systems use the brakes to help control the vehicle, so I wonder if turning the system off would make a difference in the MPG & brake pad wear.

Have you tried that or would you be willing to, to see if it makes a difference?
I have first hand experience with the trac control wearing our rear pads. I just changed the rears at 24,500 miles and the fronts still have 3/4 pad left. On my rig because of all the stop and go my job requires my pad wear will probably be a lot higher then most. This is the first 4 wheel disk vehicle I've owned that wore the rear pads out first.

Interesting thought about turning it off to see if it helps mileage. I will definitely look in to it. I drive a lot of graveled curvy roads so it kicks in and out a lot. At first it was kinda nice and saved my bacon a time or two but now that i'm used to my route its almost annoying at times. Do you know if its a simple fuse pull?
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Old 04-07-2013, 02:59 PM   #19
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On the HHO, I've read that an oxygen signal modifier is necessary to realize mileage benefits because if they detect a higher level of oxygen in the exhaust from the hydrogen burned they will call on the ecm to add fuel to stay within the pre-programmed ratios. I had not heard that it would be illegal? Seems lower emissions would be a good thing?

Thanks for all the thoughts.
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Old 04-08-2013, 12:42 AM   #20
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I found this, post #56
http://www.wranglerforum.com/f33/why...-173392-2.html

I do not yet own a JK, but it does look like it will be coming soon.

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