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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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#61 of 102 Re: Terrible Gas mileage [offer] by tsfromtx Oct 10, 2007 (7:55 am)
Replying to: offer (Jun 17, 2006 12:25 pm) My '07 GC with 4.7 V-8 has about 11K miles. Now that it's broken in, mileage isn't that bad. Only about 13.5 mpg around town; around-town traffic in Arlington Tx is horrible. Mixed city/freeway is more like 16 mpg. I get consistently 20 to 20.5 mpg on interstate driving at 70mph (I drive with a light foot & avoid hard acceleration). Pulling our 3,000 lb camping trailer, we get 15 mph on long trips.   My Jeep has a trip computer. For the first 6K miles, I checked every tank with a calculator. But computer is close to accurate - it consistantly reports 0.5 mpg better than what I get by hand checking, so I just rely on the computer now.   Overall, my observations are that the GC gets decent mileage if you are a disciplined driver; the mileage drops rapidly if you're prone to jackrabbit starts or frequent use of passing gear.
#62 of 102 diesel grand-cherokee owners in the hizzy? by elias Oct 11, 2007 (7:15 pm)
speak up diesel cherokee peeps! real trucks don't have spark plugs. seriously now, how are your diesel grand cherokees doing on mpg especially once they get >10k miles.?? maybe there just aren't enough of you folks out there, or you are cranking out so many miles per year, you don't have time to post?
#63 of 102 2006 Jeep JGC gas mileage by kpsra Oct 31, 2007 (8:17 am)
First 1/2 tank I got 13.65. 5.7L Hemi, dealer told me that gas mileage would be about the same as my traded in 98 5.2L. Does anyone think that using 93 octane would increase mileage? I currently use 89. What about acetone to increase mileage? 4oz per tank? Replies to this message: reholmes (Oct 31, 2007 8:53 am)
#64 of 102 Re: 2006 Jeep JGC gas mileage [kpsra] by reholmes Oct 31, 2007 (8:53 am)
Replying to: kpsra (Oct 31, 2007 8:17 am) I have had five GCL and all have gotten about the same mileage--I get about 17 with mixed driving and often over 20 on the road. Having said that, I have a very light foot--real tempting to jam the Hemi and scald the jerks in the Acuras. I have always used 87 octane. Am presently using full synthetic 5-20, but can't get Chrysler to commit on a full syn oil recommendation.
#65 of 102 New 2007 4.7L MPG by naatz1 Nov 11, 2007 (5:28 pm)
Using the trip computer on my first tank of gas at 302 miles I am getting 15 mpg in 100 mi's of in town average. I got 21 mpg 60mph for 20 miles of rural highway last night. This is with fairly conservative driving, no AC, usually only 1 person in the Jeep. The sales rep said expect it to increase a little after 2000 miles, also to watch E85 ethanol usage in winter temps; I was tempted to do a E85 fill today with temps in the 50s but in MN that won't last.   I will post more results in another 1-2 months after vehicle breakin but so far this is about what I expected with a small V8.
#66 of 102 Jeep Grand Cherokee - LPG by nigbo Nov 16, 2007 (7:41 am)
Hi - I run a '99 4.7L v8 GC here in the UK. Had it from new - bulletproof (my 3rd Jeep). 112, 000 miles on the clock. Had it converted to run on Liquid Petroleum Gas (LPG) at 35,000 miles. I get 23 mpg on petrol & 18 mpg on LPG - LPG is half petrol price in UK - so well worth using. Just had the lpg injection kit serviced & retuned & it seems to be performing better than ever - so mpg looks like it will increase with LPG.   Any LPG supply in the USA? If so, is there a real price advantage. Most people who run on lpg here in uk say the running cost is 60% that of petrol - taking into account the lower price, but also lower mpg Replies to this message: reholmes (Nov 16, 2007 8:16 am) nigbo (Nov 16, 2007 8:37 am)
#67 of 102 Re: Jeep Grand Cherokee - LPG [nigbo] by reholmes Nov 16, 2007 (8:16 am)
Replying to: nigbo (Nov 16, 2007 7:41 am) We have LPG here in Phoenix, but I don't know the price advantage. There was a bill passed in the Arizona Legislature to give a tax refunds up to one third of the new price of the vehicle for conversion. It wasn't a good bill and it cost the taxpayers billions! And, people with dual systems kept on using gasoline.   Do you get a lot of "pressure release" venting in your system. With temperatures around 115F here in the summer, I would imagine there would be some loss. Replies to this message: nigbo (Nov 16, 2007 8:37 am)
#68 of 102 Re: Jeep Grand Cherokee - LPG [reholmes] by nigbo Nov 16, 2007 (8:37 am)
Replying to: reholmes (Nov 16, 2007 8:16 am) not noticed any pressure release vent issues here in uk - temps get to 35°C (95 °F)   installation concessions stopped here in uk for conversion to lpg, likewise muted that the exemption from the contentious London congestion charge (£8 / day) is to stop also for lpg vehicles. so much for the alleged 'green credentials' of the politicans (spit !)

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