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Old 07-04-2013, 09:17 PM   #361
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Quote:
Originally Posted by Justgot2hunt View Post
Just took my 2013 four door/hard top w auto trans and 3.73 rear axel, 255/70/sr18 tires....on it's 1st highway trip today. Maybe 40-50 miles round trip with around 6-8 miles city (3-4 each way) before hitting the highway. Anyway, the info guage said 20.8mpg when I got back. I set the cruise at 63-64 mph going and 60 mph coming home (construction areas). Using the gas the dealer put in 2 weeks ago (87 octane ?).
Finally, someone who gets it. Thank you!

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Old 07-05-2013, 12:17 AM   #362
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I have a 2013 JKU 3.21, auto, 285/75-16 tires, 13000 miles speedo and odo recalibrated with procal and both are spot on. I have hand figured every fill up since day one. My dash mpg never matches my hand calculations and sometimes it reads higher then actual and sometimes lower then actual. I use the manual mode a lot of the time for shifting. I have both hard top and soft top. What I find odd is that there is no difference between the two as far as mpg goes. I drive a lot on the highway and 70-80mph is normal. I have often gotten over 20mpg and the only time less then 17 mpg is when off roading or doing 75-80mph into a headwind. I get less mpg in winter when they go to oxygenated fuel. I get better mpg on straight gasoline vs 10% ethanol.

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Old 07-05-2013, 03:54 PM   #363
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When I had the stock wheels/tires on and I stayed on the 2 lane roads and stayed at 55, I was able to average 22mpg. Now I'm down to 20 mpg with the 33's on.
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Old 07-05-2013, 04:12 PM   #364
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My dash mpg never matches my hand calculations and sometimes it reads higher then actual and sometimes lower then actual.
My calcs are always within a few tenths of the EVIC but I always make sure I fill to the filler neck each time and am on a flat surface. You're tracking it the right way: measuring over time. That accounts for the human factor that we cannot with 100% certainty know that we fill up the the exact same point every time.
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Old 07-05-2013, 04:31 PM   #365
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We are forgetting that the fuel economy ratings on the sticker are from the EPA tests. If there's a beef, take it up with the EPA (good luck with that).

EVIC
While many rip on EVIC inaccuracy, if you take a moment to think about it the EVIC should be the most accurate way of measuring true fuel economy. This of course assumes your tires and speedo are properly calibrated. How can this be possible you ask?

The EVIC gets its data from the vehicle computer. The vehicle computer is measuring fuel use with very high precision to meet peak performance and emissions requirements. Because of that, the vehicle computer and therefor the EVIC knows exactly how much fuel gets used over how many miles driven in a period of time and that is the actual MPG. The only way EVIC is "off" compared to hand calculations is if the speedo is not calibrated or you're losing/gaining fuel (leak/theft/evaporation/samaritan's gift) or you don't reset the EVIC at every fill-up.

Are all of us precise in filling to the exact point every time we fill up? How can you be sure you're not getting siphoned-off? I caught a kid siphoning 2gal from my other work truck (28gal tank). That's not too noticeable on a gas gauge but it'd be enough to kill the MPG calculated if it was my JK. Just sayin'
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Old 07-05-2013, 05:11 PM   #366
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Originally Posted by BManz View Post
We are forgetting that the fuel economy ratings on the sticker are from the EPA tests. If there's a beef, take it up with the EPA (good luck with that).

EVIC
While many rip on EVIC inaccuracy, if you take a moment to think about it the EVIC should be the most accurate way of measuring true fuel economy. This of course assumes your tires and speedo are properly calibrated. How can this be possible you ask?

The EVIC gets its data from the vehicle computer. The vehicle computer is measuring fuel use with very high precision to meet peak performance and emissions requirements. Because of that, the vehicle computer and therefor the EVIC knows exactly how much fuel gets used over how many miles driven in a period of time and that is the actual MPG. The only way EVIC is "off" compared to hand calculations is if the speedo is not calibrated or you're losing/gaining fuel (leak/theft/evaporation/samaritan's gift) or you don't reset the EVIC at every fill-up.

Are all of us precise in filling to the exact point every time we fill up? How can you be sure you're not getting siphoned-off? I caught a kid siphoning 2gal from my other work truck (28gal tank). That's not too noticeable on a gas gauge but it'd be enough to kill the MPG calculated if it was my JK. Just sayin'
I would challenge any kid to syphon gas from a 2013 JKU. There is a check valve in place that gets in the way.
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Old 07-06-2013, 08:31 PM   #367
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I'm getting around 21.9 MPG. This morning it went to 22.1 MPG. That's on a 2007 Sahara with 60,300 miles. That's using cuirse control and staying between 60-70.

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Old 07-06-2013, 09:14 PM   #368
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If it works like a flight computer I am sure it uses current temps as well as fuel burn and avg those every 5 to 10 seconds, it would explain my horn beeping a second late every time. That EVIC is working hard
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Old 07-07-2013, 09:26 AM   #369
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With just over 1,000 miles on my 2013 JKU auto with 3.73 gears, 92 degrees out all windows open, driving 65-70MPH I got 20.22 MPG on dash and calculated. The trip was 200 miles of all highway.

Pleased as I was going back and forth with MPG and the gearing choice when I ordered.
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Old 07-08-2013, 12:36 PM   #370
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In my attempt to increase my daily gas mileage I decided to check the condition of the sparkplugs. I had noticed a slight rough idle and already checked/cleaned the tb.
The 3.8L has 46k on the odometer and I was shocked at the gap of the drivers side plugs. The burn color was good, but the gap was almost .010 more on the drivers than the passenger. Decided to replace them with NGK Iridium since they have received good reports. The idle has smoothed out and acceleration is smoother. Will have to wait a few tank fulls to see if the MPG changes.
Dealer told me the plugs were good for 100K; not mine.
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Old 07-08-2013, 01:09 PM   #371
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I just got 18.2 mpg with A/C on, pulling a small utility trailer, and rear fully loaded up into the mountains on a camping trip for 4th of July (18.2 for entire trip). She's just over 7 weeks old.
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Old 07-08-2013, 01:24 PM   #372
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i drove from VA to NY and averaged 20.5 MPG (calculator confirmed) on my manual 2013 JKUR. i was blasting AC with cruise control OFF. i noticed cruise control dropped the MPG. i drove anywhere from 65-79 MPH depending. it was a long trip and i figured the mountains in PA would kill it but with every incline is a coasting decline.
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Old 07-16-2013, 07:55 AM   #373
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Just got back from a trip to N Carolina from Florida. Averaged 20.3 mpgs the entire time. On fuel with no ethanol, I got 21.2. Very happy.
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Old 07-16-2013, 08:23 AM   #374
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18.2. Didn't seem to change when I went to Yuma and back, or Seattle and back. I don't care though. I didn't get my Jeep cuz I was looking for 'good gas mileage', I bought it cuz I liked it!
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Old 07-16-2013, 08:38 AM   #375
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you guys know putting the top down and doors off reduces fuel economy right?
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Old 07-16-2013, 09:50 AM   #376
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Last week my wife and I took a trip to Ocean City MD from Baltimore MD. My Jeep is a 2011, just over 11000 miles on the engine with auto and 3.73 gearing. The roads are fairly flat and I kept the Jeep at about 60 MPH and I had the AC on full blast. My average MPG going down to O.C. was 23.2 and coming back the average was 22.8. Not to bad for a box with four wheels.
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Old 07-16-2013, 11:21 AM   #377
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you guys know putting the top down and doors off reduces fuel economy right?
What about folding the windshield down?
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Old 07-17-2013, 09:11 AM   #378
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2008 stock unlimited here, we pushed 21 mpg on a 350-ish mile road trip on vacation doing between 70-80 and w/the AC on - I was thouroughly impressed!
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Old 07-17-2013, 09:36 AM   #379
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I only have 800 miles on my 2013 - so it's still within the bad milage break-in period.. However, I am getting 15 MPG in my in-town city commute, and about 19 on the highway at ~75 MPH
Running A/C all the time and not driving like a granny either.

When I go the speed limit of 65 - I get much closer to 21 MPG.

3.73 final drive - manual transmission - hard top.
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Old 07-17-2013, 09:38 AM   #380
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you guys know putting the top down and doors off reduces fuel economy right?
On the highway yes - but under 50 MPH when aerodynamics don't play such a huge roll, the weight savings of a few hundred lbs (minus doors and hard top) would reduce consumption.
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Old 07-17-2013, 10:10 AM   #381
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I was pleased the last trip to the Jaws of Hell city errand: 280 miles round trip average was 20.9, best I have gotten for a while for such a distance.

3.73/auto/hard top in place/kept pretty much at 1800 rpm as much as possible. 32.8" Safari Kelly tires 285/65R18, no lift etc.

Significant difference: no traffic issues along the way

It is relatively easy to get 20+ for many miles; it's far more difficult to AVERAGE 20+ over many tanks full.

My last 3000 mile road trip through mountains of N Idaho/Montana did not quite make it to the 19mpg average.

Still grinning each trip.
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Old 07-19-2013, 02:12 PM   #382
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On the highway yes - but under 50 MPH when aerodynamics don't play such a huge roll, the weight savings of a few hundred lbs (minus doors and hard top) would reduce consumption.
I suspect it would even itself out at low speeds for a neutral.

But its more fun with the top down.
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Old 07-19-2013, 02:18 PM   #383
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Sorry if I break any rules about posting because I'm a newb but I didn't see any so I should be good.
Anyways, family just bought 2013 JKU and took a road trip the next day. Averaged about 21 mpg on the highway going no faster than 65. Its all stock.
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Old 07-19-2013, 02:43 PM   #384
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I am getting 13 with 8k miles on my baby...
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Old 07-19-2013, 03:22 PM   #385
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ok up date on mine. 37's 3" of lift auto with 3.73's and front and rear TF bumpers and HD tire carrier assembly. Corrected speedo for accurate numbers and I am getting about 18mpg. I go 60-65 on the highway religiously and from a stop I never get over 3k on the tach. I only floor it if I must. Yeah I drive like an old man lol.
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Old 07-19-2013, 07:23 PM   #386
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TeraFlex, what programer did you use?
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Old 07-22-2013, 10:07 AM   #387
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We have a chrysler code reader that also lets us change settings.
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Old 07-22-2013, 01:22 PM   #388
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One thing to keep in mind when comparing to EPA highway MPG estimates is that many people incorrectly interchange the words "freeway" and "highway".

This page shows the "schedule" (the speed of the vehicle throughout the test) of the EPA MPG tests: Detailed Test Information

Notice that the "highway" test is all below 60mph, and mostly below 55mph.

People often seem to think (at least, around here in metro Detroit) that the "highway MPG" means that's what they can expect while driving 75-80mph on freeways. I actually get close to the highway MPG (20-21) in my "city" driving, because my "city" driving is mostly on suburban roads with 45-50 mph speed limits, and I tend not to drive during peak traffic times.
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Old 07-22-2013, 01:50 PM   #389
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20.7 mpg hwy

I have a 2012 Wrangler Unlimited and I drive from Texas to Mississippi for work every other week. I am getting 20.7 consistently at 72 MPH.
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Old 07-22-2013, 02:09 PM   #390
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Mr. Dragons lives in SF Bay Area. If he goes by 680 into Dublin/Livermore, then he has to negotiate a fairly significant ridge. It's not Altamont, but good enough to put a dent into mileage.

I have a 2010, so it's a 3.8L, not Pentastar. Still, I can touch 20 mpg if I'm easy on the gas. I use to make exact records of all fuel purchases for a year. The average mileage was 19.0 mpg. Pentastar is supposed to be a better engine for the fuel economy.

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