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Unread 02-18-2013, 10:22 AM   #7861
jeremyc653
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2005 WK 
 
Join Date: Jun 2009
Location: St pete, Flordia
Posts: 652
I guess if u use the 93 tune u need to use the right octane

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Unread 02-18-2013, 10:42 AM   #7862
johngreen1234
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2010 WK 
 
Join Date: Nov 2012
Location: beverly hills, ca
Posts: 293
I wish Indy would start a new thread on this topic, so I could better assist him in getting a cold dose of reality regarding his MPG. As it is, here are some helpful talking points:

The single biggest factor for highway MPG is going to be wind resistance, not weight as he suggested in another thread. These rigs present a relatively large frontal area, and do almost nothing to mitigate wake turbulence.

He has mentioned he lifted his rig, which will make a difference. If he has a roof rack, that will make a surprisingly big difference. Similarly a light bar or other accessories hanging out in the wind like scoops. And if he has deleted his front air dam, he's just asking for it. And the bigger tires are costing him two ways: increased rolling resistance as well as wind resistance.

All these factors are going to be multiplied by how much faster than 60 mph he drives. Doesn't matter what the speed limit is, the wind resistance starts to go up quickly at 55-60 mph. All of it costs money.

I'm running stock tires, stock ride height. I take my roof rack crossbars off if I'm not using them. And I haven't added anything else to the exterior. When I bought my rig bone stock, with 36k miles, I was getting 17.x mpg all-around rural driving, measured in gallons at the pump.

Seeing how well I was doing, I started really laying on the gas pedal at starts, and especially at freeway on ramps, where I would let the roar out of the Hemi (purely in my quest for knowledge). As long as I kept the freeway speed at 60 (the speed limit) and DID NOT downshift for engine braking, it was difficult to get the mpg below 16.

I then added an aFe CAI (I know, I know, they do nothing). With the same driving pattern, it became difficult to get the MPG below 17.

Here is a profile for a typical 200-mile round trip to the mountains, where my mpg (calculated as gallons at the pump) has ALWAYS been 18.4 to 18.8:

Mostly flat, rural highway, 55 mph. Several little towns with 25-30 mph postings. When I hit the hills (about 30% of the driving time), it is nothing but twisty mountain highway with 35 the typical posting. I do much of this with my shifter set to 4 or even 3, and I make a point of letting the Hemi roar through the 15-45 mph range between turns, drifting the turns when I can.

Basically, 30% of the time I'm doing all I can to destroy the mpg, and I'm STILL getting in the upper 18s. What I'm NOT doing is using the rig as a giant parachute above 60 mph.

Hope this helps!
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Unread 02-18-2013, 11:13 AM   #7863
IndyBlueWK
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2005 WK 
 
Join Date: Feb 2012
Location: Carmel, indiana
Posts: 1,142
Thank you for the write up and yes I should of made it in a new thread.

As far as the WK goes its has the 2 inch lift with 17 inch wheels and 265 tires but thats it.. Stock Air dam and everything else on the outside.. One thing that got me wondering is when you put your CAI in there is that little box behind the grill that bring air into the intake but it is blunt on the part that faces the front of the truck. Would putting this back in help the air turbulence around my CAI? I havent found a write up on weather or not people are leaving these in or taking them out..
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Unread 02-18-2013, 11:24 AM   #7864
Billybcpt
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2005 WK 
 
Join Date: May 2011
Location: , MA
Posts: 462
While I appreciate quests for knowledge of increased MPGs, you should start another thread to talk about this! Let's not thread-jack this one
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Unread 02-18-2013, 01:52 PM   #7865
Jeepguy910
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2005 WK 
 
Join Date: Nov 2011
Location: wilmington, north carolina
Posts: 16
I got my rough country lift put on, tinted my windows yesterday.tomorrow I get my new tires put on and I get my exhaust put on sometime this week



Before

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After

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2005 Jeep Wk 5.7L V8 HEMI Black, QDII, 2" Rough Country Lift,
1.5" Rough Country Wheel Spacers, 5000K HIDs,
Flowmaster Super 44 Muffler with 3 in piping with no resonator,
35% tinted front windows and 5% tint in the back.
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Unread 02-18-2013, 02:02 PM   #7866
BobG97
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2005 WK 
 
Join Date: Dec 2010
Location: Piedmont, MO
Posts: 496
Quick question, Who buys a hemi jeep for fuel mileage? I judge mine on smiles per gallon, every time I blow around a Prius or volt I make sure to let them hear it roar! Lol
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Unread 02-18-2013, 02:08 PM   #7867
naidib04
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Location: Milwaukee, WI
Posts: 333
Quote:
Originally Posted by BobG97
Quick question, Who buys a hemi jeep for fuel mileage? I judge mine on smiles per gallon, every time I blow around a Prius or volt I make sure to let them hear it roar! Lol
Well said. I could get a **** if I got 16.
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Unread 02-18-2013, 02:15 PM   #7868
Jeepguy910
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Posts: 16
Damn i am happy to get 13mpgs when driving around town lol
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Unread 02-18-2013, 02:20 PM   #7869
ecollins7
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Location: baltimore, Maryland
Posts: 415
Finally got around to doing the rear fender mod. Had to do it before my trip to Rausch creek next month
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Unread 02-18-2013, 02:52 PM   #7870
sixfoot9psu
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Posts: 502
Quote:
Originally Posted by ecollins7 View Post
Finally got around to doing the rear fender mod. Had to do it before my trip to Rausch creek next month
what size tires are you running that you needed this mod?
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Unread 02-18-2013, 03:15 PM   #7871
ecollins7
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Quote:
Originally Posted by sixfoot9psu

what size tires are you running that you needed this mod?
I'm running 255/70 17... Not that big but it was a little bit of a problem when I was driving on the beach in NC
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Unread 02-18-2013, 03:39 PM   #7872
Theogriff15
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Location: Weston, MA
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Quote:
Originally Posted by ecollins7 View Post
Finally got around to doing the rear fender mod. Had to do it before my trip to Rausch creek next month
Who's write up did you use or did you use one at all? Regarding the weatherstripping, what's the best way to remove it and put it back on? I am in the same position as you, want to get it done before the trip that I'm hopefully making down to Rausch
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Unread 02-18-2013, 03:49 PM   #7873
ecollins7
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Quote:
Originally Posted by Theogriff15

Who's write up did you use or did you use one at all? Regarding the weatherstripping, what's the best way to remove it and put it back on? I am in the same position as you, want to get it done before the trip that I'm hopefully making down to Rausch
I don't remember who's write up I used, I think I looked at 2 of them. I just googled wk rear fender mod and got what I needed.
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Unread 02-18-2013, 03:51 PM   #7874
ecollins7
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The weather stripping slides right out and then the plastic piece it is attached to has 4 things holding it in. I just pryed it off with my hands and I think I got lucky cuz it pooped back in at the end.
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Unread 02-18-2013, 03:54 PM   #7875
Theogriff15
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ah okay, yea I saw like 4 black pushpins holding everything together when I looked yesterday, couldn't get em out with my hands though haha.
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