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Jeep Grand Cherokee Real World MPG

102 messages,  Last post on Jan 04, 2009 at 10:46 PM

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What is this discussion about? Jeep Grand Cherokee, Jeep, Fuel Efficiency (MPG), SUV

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#83 of 102 Re: Bad MPG [kwteng2] by naatz1 Jan 18, 2008 (4:24 pm)
Replying to: kwteng2 (Jan 17, 2008 11:42 am) Let me add to my reply from yesterday. I reset my MPG trip computer monitor today for the first time in 6 weeks in preparation for a 450 mile RT drive tomorrow. I drove 3 miles in back streets, used the remote start for a few minutes of warmup, waiting at numerous stop lights ... and got 9 mpg! BTW it is -3 deg F outside too. After driving home (which I call "city" driving but has 1 mile of freeway,2 miles of 45 mph with a few stop lights and 1 mile of frequent stop/go ... so perhaps it's more suburban than pure city) I was up to 14 mpg in 7 miles. -NET- I am not sure what all that means but I suppose if you have pure stop/go city driving you could be in the 9mpg range around town and have nothing wrong with the vehicle, especially if you are in a cold part of the country with winter warmups and less efficiency too.
#84 of 102 Re: gas mileage [brian211] by muchbetter Jan 24, 2008 (8:57 am)
Replying to: brian211 (Jun 17, 2006 1:03 pm) I have 148,000 on a 2001 ltd with the 4,7 and ca emissions. On the highway i get 21-22 mpg at 70. combo hwy city and off road in the woods i get 17-18 mpg. and that is with the ac on and awd, so i do not know what you are doing but you are doing something wrong
#85 of 102 Extensive test 07 4.7L AWD MPG using reg gas by naatz1 Feb 17, 2008 (2:43 pm)
There apparently are two MPG Jeep sub-columns, so let me post this data here that I just put out on the other Jeep Owners: MPG-Real World Numbers. Here is what I have measured in 3 sets of conditions after about 2000 miles of initial breakin on the 2007 Laredo 4.7L V8 with X package AWD Jeep:    1. SE Minnesota winter driving Dec7-Jan12 25% highway/75% city driving using 87 octane (MN requires 15% ethanol in it's gas). 1000 miles 15.8 MPG using the onboard computer. Frequent remote starting with 3-4 min warmups too, so this represents "real life" in northern climates.    2. MN to central TX Jan26-27. Conservative driving at 65-70mph speed limits 98% fairly level freeway with 2 adults and about 400 lbs luggage. 1162 miles 62 gal or 18.75 mpg using actual mis & gallons BUT onboard computer shows 19.4 mpg.    3.Central TX back to MN Feb15-16. Slightly faster driving at 70-75mph, 2 adults and 500 lbs luggage (big storm "chasing" us back, bought souvenirs & too many groceries). 1181mis 64 gal 18.45 mpg $187 fuel costs, but computer showing better again almost 1 mpg better than actuals. So my computer calculated mpg seems to be about 1mpg or 5% better than reality, bummer.    However, an interesting point: leaving the midwest the 87 octane gasoline is not mixed with 15% ethanol. (I have yet to try E85 due to our colder than normal hard winter where it runs rough below 10 degress and plan to try some this spring, but it's a known fact you lose 20-30% mpg/efficiency with E85.) I suspected coming back to the midwest gas pumps yesterday with a fill on the southern Iowa border my MPG might drop a bit due to this 15% ethanol ... but no, it improved?! The last 300 miles with this 15% ethanol based gas I got 19.2 mpg actual (20.2 on car computer).    BTW, this 07 Jeep vehicle is SUPERB for handling and comfort as well. Compared to our 2001 Jeep it rides MUCH better. I'd get tired in the 01 after a 4 hr trip (it also was a loaded Laredo). I can easily drive this 07 Laredo for 8 hours and even did an 11 hour stint Feb 15, more than the longest road trip ever taken in my wife's 300M which I always considered to be the most comfortable road car we have ever owned. I now have 5600 miles on this 3 month old Jeep vehicle and it's impressing me so far, no problems.
#86 of 102 Flex fuel E85 mpg by naatz1 Apr 07, 2008 (4:20 pm)
I have a new 07 JGC 4WD Laredo with the 4.7 V8 that can burn E85 (85% ethanol). E85 is fairly common in the upper midwest although even in our SE MN town of 100K there are only 10 stations that offer it (Iowa, Illinois have quite a few spots, not as much in Wisconsin). I waited until March to try it since it does not start well in below zero temps which we had intermittently during our longer than normal MN winter.   I know there is a lot of debate on the viability of current corn based ethanol and I am not a big proponent of that but do believe when/if we get the cellulosic "switch grass" ethanol refinery and distribution perfected we may see real benefits to this alternate fuel in 5 years or so ... and I bought my lifetime powertrain warranty Jeep to last me at least 10 years. Here is an excerpt of a posting I just posted on an E85 forum:   I am now on my 4th tank of E85 which has crept up from $2.28 to 2.39 and now 2.49 in just the past month in SE MN. Of course reg 87 gas w/10-15% ethanol has gone to $3.15 and now 3.25. Yikes. So E85 at 2.49/3.25 is 24% cheaper than gas (I got lucky & filled at 2.39 one more time, but corn is going up in price - where is our cellulosic ethanol please !?!?).   My MPG varies from around 13 in town to 17 on a hilly 60mph 2 lane road. I got 16mpg 70 mph level freeway that measured earlier at 19mpg w/gas which works out to 16/19 or 16% less than gas.   Net: I am slightly ahead with E85, 8% savings or on a $150/mon gas bill I save $12. Not a big deal and still harder to find stations. And some are higher than $2.49 so any advantage rapidly diminishes. It feels good to fill up at $2.39 but you do it more too. If GM and the government would push cellulosic "switch grass" ethanol we might start seeing real reasons to use it but for now with all the subsidies etc I am not in the E85 cheering squad, but not a naysayer either.
#87 of 102 Re: Jeep Grand Cherokee: Real World MPG [steve_] by albo2 Apr 20, 2008 (5:54 pm)
Replying to: steve_ (Jun 17, 2006 1:52 pm) 04 JGCL 4.0 Just came back from Sunset Beach NC (spring break) 70 mph with 3 adults 2 kids loaded back hatch and clam shell on roof. (Poor Jeep) averaged 19-20 MPG. Very pleased. I just changed all the fluids to Amsoil, Motor Oil, oil filter, Trans fluid, front and rear diffs, and transfer case. I've always used Mobil 1 but afer looking at the ball wear test data found Mobil 1 to be at the bottom of the pile. Spent a little more for my Jeep. This is about a 4 mile per gallon increase from last years same trip, the jeep seems to want to coast forever. Replies to this message: steve_ (Apr 20, 2008 8:37 pm) reholmes (Apr 21, 2008 8:55 am)
#88 of 102 Re: Jeep Grand Cherokee: Real World MPG [albo2] by steve_ HOST Apr 20, 2008 (8:37 pm)
Replying to: albo2 (Apr 20, 2008 5:54 pm) You might get some discussion going on the 4 ball test over in the Engine Oil - A slippery subject Part 2 board. Some people say that test is geared towards grease, not engine oil.
#89 of 102 Re: Jeep Grand Cherokee: Real World MPG [albo2] by reholmes Apr 21, 2008 (8:55 am)
Replying to: albo2 (Apr 20, 2008 5:54 pm) We're on JGCL #6 and have found when not using the special--and very expensive--gear oil additive in the boxes we have excessive diff lock up noise--and probably wear. I realize Amsoil products are extraordinary, but you probably have a 75k drive train warranty that may be invalidated without the "Jeep stuff" in your boxes.
#90 of 102 2007 GC Diesel, mileage update by sahara111 Apr 21, 2008 (12:57 pm)
Hi,   Thought I would post some of my fuel mileage numbers for this forum. As of my last fill-up I now have 17603 miles (since new purchase last August). I recently (at the 16881 mile point) calculated the average of my fill-ups for the first approx 1/2 of ownership (8344 miles) and the 2nd half (the 16881 mileage). The numbers are: 1st half = 25.172 actual mpg. 2nd half = 25.577 actual mpg. Note, of course this is for all mileage, not just hwy or commuting miles; this is my only vehicle so I do everything including stop-n-go grocery shopping with it.   A few other numbers of possible interest: in my vehicle (as I pointed out several months ago) the Trip Computer reads low. I keep track of this too (see below) and the overall average since new is it reads 1.87 low. And the overall average of my fill-ups since new is now at 25.428 (and continuing to climb). Here is my last fill-up - I'll test the formatting in this editor to see if it holds when I post it.. - and then post more numbers in the next message:   Odometer Trip Computer Trip Dist. Gallons MPG ACTUAL Trip comptr diff.   17603 24.2 399.3 14.859 26.872 2.67   Later.
#91 of 102 2007 GC Diesel, mileage update again by sahara111 Apr 21, 2008 (1:24 pm)
Okay - that formatting doesn't work!! So, I'll enter it differently. Here are the last several of my fill-up data in this format:   Odom - 14983 Trp Cmptr - 22.5 Trip Dist - 388.4 Gals - 15.609 ACTUAL - 24.883 MPG (Trp Cmptr error - 2.38)   15437 24.2 453.4 17.452 25.979 MPG (1.78)   15769 23.3 331.9 13.291 24.971 MPG (1.67)   16128 25.3 358.8 12.990 27.621 MPG (2.32)   16462 24.2 334.6 12.524 26.716 MPG (2.52)   16881 24.8 418.9 15.758 26.583 MPG (1.78)   17203 24.3 322.0 12.489 25.782 MPG (1.48)   ...and the latest posted in prev msg.. Pls recall that I previously checked the odometer and trip meters with a GPS, which showed them essentially spot on. The only issue is the trip computer calculation which you can see varies each time.   Keep in mind, even with the current 65-70 cent difference in fuel costs (vs. regular), I am still ahead or breaking even because I am on pace for my planned 30,000 miles per year - so I do enough mileage for that one aspect to make sense.   Also keep in mind the majority of this has been cold weather miles. Supposedly, diesel efficiency will become better in warm weather but of course I'm not banking on that; we'll see shortly anyway...   I agree with whoever that the vehicle is very comfortable for long distance driving. Plus, the extra sound proofing w/the diesel option makes it very, very quite. I really do absolutely love the vehicle and am very glad I went this route. It really makes tons of sense for me, although I understand not for everyone.   Later. Replies to this message: 96gc1owner (May 06, 2008 4:51 pm) sahara111 (May 06, 2008 7:59 pm)
#92 of 102 Why moving up to higher MPG SUV really does count by sahara111 Apr 21, 2008 (3:45 pm)
Hi all,   Sorry; meant to post this sooner but had lost it for awhile. Anyway, short synopsis: moving from SUVs in the mid-teens MPG up to say low-mid MPG is far more important that moving from Civics or whatever to higher MPG small hybrids, etc. Probably many of you have already surmised this, but the actual graphs and math help tell the story.   Here is the main link: http://daily.sightline.org/daily_score/archive/2007/12/20/18-is-enough   And/or, you can more quickly see the math here: http://daily.sightline.org/daily_score/archive/2007/12/19/how-suvs-can-save-the-- climate   So, I thought this was interesting and maybe a little relevant.

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