Gas Hog -

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post #1 of 10 Old 11-14-2007, 08:51 AM Thread Starter
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Gas Hog

I have a 06 GC V-8, less than 15,000 miles on it, I love this thing but it is killing my bank account. Get 14.1 city and 15.3 hwy, I try and take it easy but no matter what this is what I get. Boy did the saleman lie to me. He said expect at least 20 mpg. Even tried the crusie control, no luck. And with gas going up to $4.00 soon, yikes!! Should of got a V-6, what was I thinking??

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post #2 of 10 Old 11-14-2007, 10:03 AM
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Have you cleaned the air filter? Tire pressure good? PCV valve working?
I have an 06 also. 4.7 V8 I average 15.1 in the city but haven't had a chance to do any significant hiway driving. You should be getting at least 2-4 MPG better
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post #3 of 10 Old 11-14-2007, 11:01 AM
2007GC Overland
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Hi Folks
here is the problem - the EPA mileage estimates are based on doing 50 mph (highway) - we generally travel at 70+ mph on the highway. I bet if you do 55 MPH and set the cruse control, your mileage would go up. My Hemi gets about 15.5 to 17 MPG on the highway. But when you are doing 75 MPH that is not bad. My 96 GC had the 318 V8, if I did 55 MPH, the mileage would go over 20 but who does 55?
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post #4 of 10 Old 11-14-2007, 12:42 PM
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I have a 05 Laredo 4.7
You should get 14-16 city 17-20 highway

I got 18.5 doing 65 mph
after I put a K &N drop in I can get 19-20 doing 70 mph
You'll get better MPG once your 4.7 is broken in
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post #5 of 10 Old 11-14-2007, 02:46 PM
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I can get almost 19 mpg running 70-75 mph on 89 octane with 16,000 miles on the '07 Hemi. That is just a little worse than our previous 2004 Mountaineer V6. Around town, my own fault for getting only 12 mpg ans I like the exhaust sound and thrust.
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post #6 of 10 Old 11-18-2007, 03:17 PM
2007GC Overland
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Hi Folks
I had to drive on highway and some streets - I reset the MPG and I averaged 18.9 MPG. That did include some driving under 40 MPH. Maybe the Hemi isn't bad as I original thought - not bad - have 6500.
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post #7 of 10 Old 12-04-2007, 08:20 AM
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You can also reset the MPG on the computer. You might see 15 mpg because its an avareage of all ur driving. Try to reset it while doing 65 70- mph. You should get atleast 17-18 mpg. The k &N drop in filter def makes a diffrence of about 1 - 2 mpg better on the highway.
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post #8 of 10 Old 12-04-2007, 11:00 AM
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Agreed. You definitely need to reset your EVIC when you are taking a good long highway trip. I did this recently and was able to get 22 MPG on the EVIC. Real world numbers where about right too. The total mileage on that tank of gas was 402 (BTW, I was using Exxon 87 octane on that tank). My 4.7 has almost 20K miles on it now. In town I get anywhere between 12-16. Try to keep the Revs at around 1900 on the highway. That is the sweet spot for my WK. When I go over 2000 rpm on the highway my MPG gets slightly lower: ~18-19. The EVIC really does keep a total average so really low MPGs will bring the total down.

2006 Jeep Grand Cherokee Laredo (WK) 28E
4.7 V8, Quadra-Trac II, Black Exterior, Light Khaki Interior
Upgraded: Mopar Sport Utility Crossbars

2008 Jeep Patriot Sporkt (MK) 26E
2.4L, CVVTII, 2WD, Black Exterior, Dark Gray Interior
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post #9 of 10 Old 12-05-2007, 12:07 AM
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i think its almost normal for V8 in jeep.
i had 4,7 in wj, which is the same engine. maybe guys you have different city driving, but in our country the city drivin seems like in N.Y. no wider roads, around the city, no bypass, which could lighten city traffic. really terrible. so when you stuck in the city, it is real stop and go.
the best gas consumption i had was 12,9L/100 km. and i didnt want so much from my WJ, very easy rider.
with cruise control set at 90 km/h, evic said values from 11,8 - 12,5 l/100km, depending on road(hill, plane).
at 160 km/h said 17 - 19 l/100 km and about 195 km/h about 24 l/100km.
that is the highway. on our highways people travel mostly from 70 mph above.
i cant believe that someone gets 18MPG in combined mode. the best i did, very economical ride, was combined 16 MPG. but you cant exepct that vehicle estimated by EPA in urban conditions e.g.12 mpg will dig less gas. even more sometimes.

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post #10 of 10 Old 12-05-2007, 05:59 AM
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I have the Hemi, but the best I can get on the freeway at 60 - 75 ish is about 17. Around town driving fairly easy is 13 at the best, the absolute best.
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