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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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#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 !)
#71 of 102 2007 GC Diesel, 4x4, 5-spd by sahara111 Dec 02, 2007 (1:49 am)
Hi, just adding my data to the conversation.   My mileage has gone up from new of 24.0 mixed (mostly highway commuting) to sometimes 26.5. I have one fill-up at 27.3, and am sitting on apparently another that will be 27mpg. It is truly improving, and you can feel the engine/transmission loosening up and continuing to settle in. Similar, but different than my ‘05 Passat TDI did (sold at 42k miles….). Looking now at my spreadsheet; the lowest I have is about 23.13 and just one other less than 24mpg; my overall average thus far is 25.08. (NOTE: I have checked the GC’s trip meter with a GPS unit just a week ago and it’s excellent: trip meter says 5.0 miles, GPS = 4.98 so very little diff). I have about 8200 miles total at this point. Again, my mileage is mostly commuting on I-5/local hwys at 55-75mph with some slow-n-go’s and a lot drafting (by necessity). Open highway will be slightly less. VERY IMPORTANT: be sure to closely check and understand the accuracy of your Trip Computer MPG reading. Mine reads 1.9 low (average, over 12 readings...). Thus, when it says around 24.0 (common for my driving..) I'm really at about 25.9. I love the vehicle, I'm glad I bought it. I I was able to get it for about $7700 off of the MSRP - thus putting it within 'striking' distance of the '08 Highlander and the new Saturn crossover price-wise. This is my 2nd diesel recently (had an '05 VW Passat TDI; 43 mpg same driving!). I intend to make all future purchases be diesel. Replies to this message: naatz1 (Dec 02, 2007 6:28 am) podedwards (Dec 02, 2007 6:51 am) coolrider (Jan 14, 2008 4:39 pm) podedwards (Jan 14, 2008 7:06 pm)
#72 of 102 Re: 2007 GC Diesel, 4x4, 5-spd [sahara111] vs 4.7 flex by naatz1 Dec 02, 2007 (6:28 am)
Replying to: sahara111 (Dec 02, 2007 1:49 am) That's impressive MPG. I might have considered a diesel except for the price differential, lack of lifetime drivetrain warranty (our dealership even thought that was nuts for Chrysler to exclude them, if anything runs 250k+ miles its a CRD), below zero MN winters, and inflated diesel prices esp in winter as it's $3.50/gal here today with 87gas $2.95 and E85 $2.15. Would be interested in your state & diesel prices since the midwest really jacks them up the past few winters.   I have a few posts above as I eventually did buy a 4.7L to get the better towing vs the V6, going against my initial thoughts to not have a V8 but finding out it only got 5% worse mpg than the V6 with 30% more torque. I also looked at the same Highlander, Outlook (& Veracruz). With 1200 mi I still am getting 15mpg town (incl a few warmups idling, remote start is very nice) and 20mpg 70mpg freeway but did notice going into the wind that dropped to 18mpg for a Thanksgiving trip. Sounds like you are more familiar with a diesel than me: I still remember in the 80s guys at work here in MN going out 2-3 times per day to run them for 20 mins on the few days we get where the high is -5F. Hopefully things have improved in 20 years.
#73 of 102 Re: 2007 GC Diesel, 4x4, 5-spd [sahara111] by podedwards Dec 02, 2007 (6:51 am)
Replying to: sahara111 (Dec 02, 2007 1:49 am) A diesel operated 40k (average 25 m.p.g) versus gas (average 20 m.p.g) operated for 40K, the diesel will cost in excess of $2500 more to operate calculating only increased fuel costs and increased purchase cost of the vehicle. Modern gas engines are more reliable and far less costly to repair for about 200K miles.   Diesels are more efficient than gas for pulling very heavy loads while operating almost continually for than 200K.   This efficiency does not translate for the average auto driver.   Remember, European nations have subsidized diesel and penalized gas to the detriment of Europeans who drive much shorter distances and who drive less frequently. This is social policy and not better economic insight. Mass transit is heavily subsidized in Europe to the economic detriment of individual drivers to support powerful labor unions representing mass transit workers.

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