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Unread 08-04-2010, 08:17 PM   #16
troy32323
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Almost forgot to mention something that someone else just did.

I keep my tires at 40 pounds. Makes a huge difference in gas mileage. They are the stock all terrain and it drives real nice. May not be a good idea for more aggressive tires.

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Unread 08-04-2010, 08:47 PM   #17
rirrgang
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If you are counting gas mileage, you are driving the wrong truck.
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Unread 08-04-2010, 08:55 PM   #18
1222
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Quote:
Originally Posted by troy32323 View Post
I keep my tires at 40 pounds. Makes a huge difference in gas mileage. They are the stock all terrain and it drives real nice.
Since youíre riding on 40 psi then try 32 and youíll think your floating on clouds.
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Unread 08-04-2010, 09:02 PM   #19
troy32323
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I do ride on them at 25 or 30 a lot when there is a line at the air pump at the beach. I just drive home and use my compressor. I do not like how it rides at 30. It is a soft ride but it feels sluggish and does not roll as easy as it does with 40 pounds. It does not ride rough at all with 40.
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Unread 08-04-2010, 09:26 PM   #20
JeffinWesternWA
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I feel like mine "skips" a bit on raod surfaces like an on/off freeway ramp or a potholed rough country road when at 37 PSI cold, and the suggested pressure is 35, bet I'd like the ride at 32 PSI but, wonder if my low tire warning would go off at that temp (see my post ref just that this past weekend). so I've settled at 36-37 lb for tire wear and ride/economy....I'd rather get over the "magic" 20 MPG figure...Maybe the factory trailer tow pack that I have makes it seem rougher riding? Is it having any different suspension components? I don't know...
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Unread 08-04-2010, 09:40 PM   #21
1222
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Quote:
Originally Posted by troy32323 View Post
I do ride on them at 25 or 30 a lot when there is a line at the air pump at the beach. I just drive home and use my compressor. I do not like how it rides at 30. It is a soft ride but it feels sluggish and does not roll as easy as it does with 40 pounds. It does not ride rough at all with 40.
Thatís interesting. I can tell the difference with mine from say 35 psi to 30. Much smother ride indeed. But Iím running mud terrain tires versus all terrainís which you have. Perhaps thatís why the difference. There could be a difference in road quality between Vegas and Long Island.
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Unread 08-04-2010, 09:44 PM   #22
McKBrew
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I couldn't imagine running my tires at 40PSI. They are bearable at 28.

My gas mileage varies, but is about 13 mpg city and 16-17 Hwy. I have done a better on longer trips with cruise control and sticking to about 60mph. (Up to 19mpg).
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Unread 08-04-2010, 10:37 PM   #23
fan45acp
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15-18mpg
6-speed
4.56 gears
2dr (when I'm wearing them)
35" tires
3" lift
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Unread 08-04-2010, 11:28 PM   #24
drowe303
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Quote:
Originally Posted by rirrgang View Post
If you are counting gas mileage, you are driving the wrong truck.
Truck?

But why is that? Is one not supposed to wonder about his/her gas mileage if they are driving a Jeep?
(My second by the way..)
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Unread 08-04-2010, 11:36 PM   #25
BenderX
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I'm getting ~15 mpg city and ~17 mpg highway with the following:
35" tires
3.5" lift
4 door
6-speed manual
4.10 gears
Some A/C usage
2500-3000 ft elevation
Occasionally driving over curbs, trash cans, mailboxes :-)

My city fuel economy would be worse if I was somewhere that had serious stop & go traffic.
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Unread 08-05-2010, 01:46 AM   #26
wrestlerobx
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Quote:
Originally Posted by RickyRedJK View Post
2010 Unlimited Sport all stock (I know, shut up), 6spd, 3.73 rear end, P255/75R17, I have just over 5000 miles on it and have a running MPG average of 18.62 (calculated, not computer). My best mileage on a tank was just a bit over 20 MPG, and my worst tankful(s) was on vacation doing 70-75 on the interstate for hours at a time, and then it avg'd 16.8 MPG.

Given that I'm all stock, I would think, compared to some of the comments I've read here, i'd be a bit higher than 20ish on the highway without a lead foot...but, on the other hand I'm glad it still holds almost 17MPG at interstate speeds fully loaded w/passangers and wife's unholy amount of luggage.

YMMV.
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Unread 08-05-2010, 02:00 AM   #27
waterboarder
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Quote:
Originally Posted by drowe303 View Post
Now that I have 35s and a 2.5" lift, I get about 13mpg.
I get about 12.5 to 13.5MPG and I do not have the big tires or lift (I'm basically stock - 33" tires, no lift). So, looks about right to me.
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Unread 08-05-2010, 05:19 AM   #28
rennypogo
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I don't know what I get per mile? ... With the constant fluctuation in gas prices, I tend to think of how many dollars per fill-up.
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Unread 08-05-2010, 08:02 AM   #29
Ravik
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I'd like to add that if you're using the onboard MPG readout, it appears to average a lot of miles, which makes 'city' or 'highway' numbers tricky to work out if you tend to do a lot of both.

For example, I tend to get right around 18 in town when calculated by pencil. (stock 2dr rubi, 6spd) But looking at the readout on the dash it can be anywhere from 15 to 21 depending on what I did over the weekend.

Monday and Tuesday I was at 21, right now it's reading 19.9, but that's after a weekend up in Fairplay - which on the way back down to Denver I can hold 25-27mpg for about 100 miles and actually see the 'eco' light come on. Yay gravity!

Conversely, if I head out East to my bunker, where the highway speeds are in the 80mph range and theres typically a 30mph head wind for about 100 miles, the Jeep will happily inform me that I'm getting 12mpg and the week after the trip it'll read around 15 on the display.

If I skip my weekend road trip, the 3 miles back and forth to work for a couple weeks will put the readout back into the 18 range that I get via pencil.

So, long story short, for any sort of accurate assessment of MPG either compute by hand or reset the display often.
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Unread 08-05-2010, 10:56 AM   #30
N2rock
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35's, auto, 5.13 gears. I get 12.5 around town, and 16 highway

Before regearing I had 4.10's. When I had stock 32" tires I was getting 14 city and 18-20 highway

then 4.10's with 35's I was getting 12 city and 16.5 highway

So the gear change really did not make any real difference in the mpg- I got slightly better city because the engine did not have to work as hard when accelerating from stops. And I got slightly worse on highway because the engine now runs at a higher rpm.
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3.8L V6 , 35" tires , JK Wrangler , mileage , miles per gallon , mpg , wrangler

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