2005 rubicon unlimited gas mileage - JeepForum.com
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post #1 of 16 Old 02-09-2011, 07:42 AM Thread Starter
maxum3300
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2005 rubicon unlimited gas mileage

Guys, normally I dont care about gas mileage when it comes to driving my jeep but with the current gas prices I wanted to see if anyone actually gets the mileage that jeep claims. Jeep claims the 05 Rubicon Unlimited gets 15 mpg city and 19 mpg hwy. I am planning a trip at the end of this month to go from Virginia to Florida. My Rubi is lifted 4 inches with 315/75-16 Mickey Thompson Baja ATZ tires and the last time i made this trip it cost me $400 in gas alone round trip and i averaged between 11-13 mpg's. I'm considering putting my stock tires back on for the trip just to get better gas mileage, but is it really worth it? Does anyone, with a stock rubi unlimited actually get 19mpg's on the highway? I could take my wifes Camry but who wants to go to the beach in a camry when they have a wrangler? Going to Florida without the jeep would be like going to the beach without a swimsuit.

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post #2 of 16 Old 02-09-2011, 08:09 AM
srfnfly227
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I have a 2006 Unlimited Rubicon with the 6-speed manual and I have never gotten what Jeep claimed on the sticker. When I bought it, I was in Philadelphia and averaged about 13 around town and 15-16 highway. The highway mileage was driving from Philadelphia down to Virginia Beach via the Eastern Shore. I never did get the city driving to get higher, but I slowed down from 67 to 62 and the highway mileage increased to 16-17.

I have been back in Virginia Beach for the last 4 years and now average about 14.5 around town. Highway mileage is still in the 16-17 range with the best I have ever gotten at about 18.

This is all stock gearing and stock tires.
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post #3 of 16 Old 02-09-2011, 09:33 AM Thread Starter
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My Rubi is a 6speed as well with stock gears, 4.10 or 4.11. Now my wife is saying she wants to take the jetskis so we have to take the jeep. Looks like i am going to swap the tires. Towing the jetskis with the 315/75-16 tires, i will be lucky to get 10 mpg's.
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post #4 of 16 Old 02-09-2011, 09:34 AM
newguy2004
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YOu both should feel special i get 6MPG. On the highway thats with 37's and 5.13's
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post #5 of 16 Old 02-09-2011, 09:37 AM
odyssey017
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I got a 06 6-speed lj Rubicon everthing stock and i get just a tad above 17 doing 78 on flat interstate
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post #6 of 16 Old 02-09-2011, 09:44 AM
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Even with the stock tires back on you may not hit your goal as the lift creates an under-draft and also removes the factory rake, both of which reduce mileage significantly. In addition, most interstate legal speedlimits are higher than the speed at which the estimated MPG is based upon.
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post #7 of 16 Old 02-09-2011, 09:46 AM
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Quote:
Originally Posted by newguy2004 View Post
YOu both should feel special i get 6MPG. On the highway thats with 37's and 5.13's
Something is wrong. That's outrageous.

OlllllllO

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post #8 of 16 Old 02-09-2011, 09:56 AM Thread Starter
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Turning the 265/75-16's has got to be easire than turning 315/75-16's.
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post #9 of 16 Old 02-09-2011, 10:02 AM
viperbluelx
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trade it for a Prius?

04 Rubicon, 5.5" RE LA with Tri-link, 35" KM2, 4.88's
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post #10 of 16 Old 02-09-2011, 10:04 AM
Aalbury
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315/75 16 mud terrain tires, I drive about 80% highway 20% in town. I get a pretty consistant 15 to 16 mpg. I'm pretty tickled with that

1995 Rio Grande -Stolen 5-10-10 gone but not forgotten.
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KD8NKV
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post #11 of 16 Old 02-09-2011, 10:22 AM
keithert
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Last summer when I first bought my LJ automatic it got 21 on a highway trip and 16 around town. With 31 inch Duratracs it has gotten 14 around town and 18 on the road. In the winter it's been getting between 13 and 17. I'm hoping it goes up some once winter ends.

Current: 2016 Ram 1500 Sport - Past: 05 Wrangler LJ, 90 and 92 Trackers and 98 Wrangler SE
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post #12 of 16 Old 02-09-2011, 10:43 AM
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All aspects of test is controlled by the EPA not the manufacturer so Jeep is not to blame on inflated numbers. Starting in 2008 the tests were updated to include more real world scenarios and gets closer to the real world now.

This Edmund's article does a goes into what changed.

Bottom line before 2008 highway speed was limited to 60mph, no defroster, no AC. Very slow acceleration and slow braking where mandated in the tests. This caused inflated numbers vs real world.

My heavily armored 6spd 06 running 35" tires and 5.13 gears gets 12 to 13 on the highway doing 75.


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97 TJ: daughter 1 - 2.5L, Auto, 2" BB, 31" GY Duratrac
98 TJ: Daugher 2 - 4.0L, 5spd, D44 rear
06 LJ Rubicon: mine - Rokmen full up-armor, 8 adjustable CAs, front bumper, sliders, corners, Shrockworks rear bumper, 3" AEV/BDS lift, Currie HD stearing and Antirock, MT/r - k 35x12.5, SuperWinch, MC Overlines, York OBA
13 JKU Rubicon: Wife's for now, Ace Rock rails & rear bumper tire carrier, Truck Lites, MC Game changer 3.5 lift, RR skids, PSC Brawler front bumper, Warn 9.5cti-s, 35" GY MTRs
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post #13 of 16 Old 02-09-2011, 11:16 AM
ytowntj
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New gears would serve you pretty well. ideally keep it at 24-2500 rpm while interstate cruising. If that means 4th gear so be it.

Also, the crap gas they sell here in the winter drops mine about 3 mpg.

i dont care what scientists say, pros say etc...for 2.5 years, 3 consecutive winters with 2 summers in between I have logged my gas mileage and get 2.8-3 mpg worse from early december to early april. same tires/psi/gears and driving habits are similar. Just something to think about.
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post #14 of 16 Old 02-09-2011, 12:49 PM Thread Starter
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I found that with the stock tires and 4.10 gears my rpms were relatively high. In the 3000rpm range at highway speeds. When i put the lift in and the 315/75-16 tires that brought the rpms down to the 24-2500 range. I didnt think about the rpms. If i put the stock tires back on my rpms are going to go up at highway speeds. So what do i do to get the best gas mileage for this trip, leave the 315's on for the lower rpm's or put the stock tires back on? This will cause the rpms to increase at higway speeds but at the same time theres a lot less rubber and weight for the motor to turn.
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post #15 of 16 Old 02-09-2011, 03:54 PM
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All the new '05-'06 Jeeps were rated at 15 city, 19 hwy, w/ 6spd. Autos were rated 18 hwy. Back when they were new on the lot, that was how I determined which ones had the 6spd, as I drove past the dealer stock. It did'nt matter if it was a Rubicon, X, Sport, or LJ. Or what axle they came with, They all had the same ratings!

JEEP THE AR-15 OF THE AUTOMOTIVE WORLD
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