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-   -   AWFUL Gas Mileage (http://www.wranglerforum.com/f274/awful-gas-mileage-63685.html)

ncossey 09-30-2010 09:59 PM

AWFUL Gas Mileage
 
How many miles on average are you guys getting to a tank of gas, because my wrangler is getting complete garbage. I am running 33 a/ts with 2 inch spacer lift. I generally stay around 65-70 on the interstate and never break 2200 rpms, and yet I am getting way less than 120 miles to a half tank of gas. 07 wrangler 2 door, no lights on the dash btw, and this is with a/c off. Any ideas, clogged injectors? Bad 02 sensor, someone please help me I know I am supposed to get bad gas mileage but this is just rediculous.

ESP 09-30-2010 10:22 PM

I was getting mid 17s when driving it stock with small street tires in city and over 20+ on the interstate. Then I bought the Duratracs and that number went down to about 16.8 in city and at best 18 on the interstate with no other mods. I'm getting bigger tires tomorrow and new rims but they are both lighter and have less rolling resistance than what I'm running currently. I'm also about to drop the hard top in favor of a new sun rider soft top so my MPG will surely return to around 17-18 in city and over 20 on the interstate.

I fill up after driving about 240-250 miles per tank and my "DTE" indicator tells me that I could still go another 30-40 miles but I fill up anyway at that point. Hope this helps. Not sure if yours can be improved or not but I know from running tanks of all three types of octane gas in my 2010 JK that it gets by far the best performance and MPG with 87 octane or regular gas.

newIRONsides 09-30-2010 10:29 PM

I'm currently getting around 10 mpg in my 06 wrangler. I'm running goodyear wrangler 35's though, so it's to be expected. I'm actually regearing tomorrow (4.88's!) and hoping to get at least close to 15mpg after. For your problem, try some of the injector cleaner at the gas stations, and definitely stick with the 87 octane- that's what our jeeps are tuned for.

hig4s 09-30-2010 10:38 PM

Quote:

Originally Posted by ncossey (Post 796351)
How many miles on average are you guys getting to a tank of gas, because my wrangler is getting complete garbage. I am running 33 a/ts with 2 inch spacer lift. I generally stay around 65-70 on the interstate and never break 2200 rpms, and yet I am getting way less than 120 miles to a half tank of gas. 07 wrangler 2 door, no lights on the dash btw, and this is with a/c off. Any ideas, clogged injectors? Bad 02 sensor, someone please help me I know I am supposed to get bad gas mileage but this is just rediculous.


Stock I was getting 17mpg overall, now with 265/75-16s I'm getting 15.5mpg,, I have read that the most efficient engine RPM is 2700, so with my current tank I am shifting later and keeping the revs up.. I don't even use 6th gear for 65 on the freeway anymore. I have another thread going on it and will post there next week when this tank of gas is done.

harwa004 09-30-2010 10:40 PM

I prefer to remain ignorant. Ignorance is bliss.

I just feed her when she is thirsty.

Owen_TJ 09-30-2010 10:40 PM

I averaged 19 miles a gallon on my 2.5L 4 cyl last tank...

If you bought the jeep for mpg, you bought the wrong vehicle lol

ESP 09-30-2010 10:44 PM

Quote:

Originally Posted by harwa004 (Post 796436)
I prefer to remain ignorant. Ignorance is bliss.

I just feed her when she is thirsty.

which is often :p

firehawk_1989 09-30-2010 10:45 PM

I get 19-20 in the city, and 20-22 on the highway, all stock. Not sure how many miles to the tank though.

harwa004 09-30-2010 10:54 PM

Quote:

Originally Posted by ESP123 (Post 796441)
which is often :p

VERY. Filled her up last night, and she is already down to 1/4 tank tonight. :(

Oh well. She is good to me, otherwise. :D

goldenfalcon 09-30-2010 10:58 PM

I get 21.77 MPG (5 076 Miles) highway and city, with P225/75R16, auto transmission, and Speed Control On. And 23.76 MPG (60 406 miles) with my Pat CVTII. I think it`s good.

ncossey 09-30-2010 10:59 PM

Quote:


If you bought the jeep for mpg, you bought the wrong vehicle lol

I love how everytime someone has a question about gas mileage some wise guy has to chime in with this. I clearly understand the concept that the wrangler gets bad mileage. Although my inferior 130+ post compared to your 100+ post may label me as a newbie, THIS ISN'T MY FIRST RODEO YOU CLOWN. I was commenting on the fact that I am not even getting close to whats expected of a 3.8 liter engine, not your 4 banger, or that dudes 4.0 up top. Even with 33's and a very small 2 inch lift, I should still be getting ATLEAST 16-17 mpg on the interstate since I never drive over 70 and never hit over 2200 rpms. Please don't bother posting if you are gonna scold me about the "shouldn't have bought a wrangler if you wanted good gas mileage blah blah blah blah", I AM WELL AWARE.

Hiker 09-30-2010 11:20 PM

Looks like you're right around 13 MPG (120 miles divided by 9.25 gallons of gas ( tank) = 12.97 MPG)

I've noticed on my new 2 door sport, which is still stock, except I've removed the rear seat (so there is a little less weight) that I've been getting up to around 22 MPG.. but most of that driving has been on highways with 55 MPH speed limits.

Probably the Mods and MPH (65-70) are not helping your bottom line MPG - but you might also try checking your air filter. If it's been over 12K since you last changed it, it could be well worth doing, since a clean filter may also help bump up your MPG a bit.

ncossey 09-30-2010 11:25 PM

Quote:

Originally Posted by Hiker (Post 796526)
Looks like you're right around 13 MPG (120 miles divided by 9.25 gallons of gas ( tank) = 12.97 MPG)

I've noticed on my new 2 door sport, which is still stock, except I've removed the rear seat (so there is a little less weight) that I've been getting up to around 22 MPG.. but most of that driving has been on highways with 55 MPH speed limits.

Probably the Mods and MPH (65-70) are not helping your bottom line MPG - but you might also try checking your air filter. If it's been over 12K since you last changed it, it could be well worth doing, since a clean filter may also help bump up your MPG a bit.


Thank you for the input sir.

TDCoffee 09-30-2010 11:25 PM

I have been getting 16-18 bone stock with 225/75/16's that came with. I tried slowing down my average speed on the highway from around 70 to around 65. I did this for an entire tank and my mpg was up to 18.4 over last tank's 17.2.

I just don't understand the guys who say they are getting 20+.

I also found I get the best mpg with my soft top down, and worst with it closed.

daggo66 09-30-2010 11:27 PM

Quote:

Originally Posted by ncossey (Post 796481)
I love how everytime someone has a question about gas mileage some wise guy has to chime in with this. I clearly understand the concept that the wrangler gets bad mileage. Although my inferior 130+ post compared to your 100+ post may label me as a newbie, THIS ISN'T MY FIRST RODEO YOU CLOWN. I was commenting on the fact that I am not even getting close to whats expected of a 3.8 liter engine, not your 4 banger, or that dudes 4.0 up top. Even with 33's and a very small 2 inch lift, I should still be getting ATLEAST 16-17 mpg on the interstate since I never drive over 70 and never hit over 2200 rpms. Please don't bother posting if you are gonna scold me about the "shouldn't have bought a wrangler if you wanted good gas mileage blah blah blah blah", I AM WELL AWARE.

Easy Francis.

Bladerunner32262 09-30-2010 11:28 PM

I get around 22-23. Take it slow off the line, use the cruise (a lot), shift nice & easy if it's manual, keep your tires inflated and service the engine.

ncossey 09-30-2010 11:30 PM

Quote:

Originally Posted by TDCoffee (Post 796536)
I have been getting 16-18 bone stock with 225/75/16's that came with. I tried slowing down my average speed on the highway from around 70 to around 65. I did this for an entire tank and my mpg was up to 18.4 over last tank's 17.2.

I just don't understand the guys who say they are getting 20+.

I also found I get the best mpg with my soft top down, and worst with it closed.

I totally agree with you man. I have a buddy who has the exact same jeep as me, but his is a rubicon, which has lower gears, and he swears up and down that if he sets his cruise to 63mph, he can get up to 21 mpg on the interstate average. I just don't understand this. I can fill my jeep up, make one trip to school, which is less than 90 miles, and I am already well below 3/4 of a tank, by the time I get back home from school, I am sitting right above 1/4 of a tank. I need to have my speedo recalibrated to see exactly how many miles I am traveling, but when I am doing 60 on my speedo, I am really doing 70, so if I travel for one hour at 60 mph (70 really) my odometer should only be 10 miles off. I was really hoping someone else has had this problem and had a miracle fix, maybe ill try seafoaming the brake booster, ive done it to vehicles in the past and it definitely helped with fuel mileage, I just can't see an 07 with 60,000 miles being that gummed up.

QtMcShorty 09-30-2010 11:30 PM

Quote:

Originally Posted by ncossey (Post 796481)
I love how everytime someone has a question about gas mileage some wise guy has to chime in with this. I clearly understand the concept that the wrangler gets bad mileage. Although my inferior 130+ post compared to your 100+ post may label me as a newbie, THIS ISN'T MY FIRST RODEO YOU CLOWN. I was commenting on the fact that I am not even getting close to whats expected of a 3.8 liter engine, not your 4 banger, or that dudes 4.0 up top. Even with 33's and a very small 2 inch lift, I should still be getting ATLEAST 16-17 mpg on the interstate since I never drive over 70 and never hit over 2200 rpms. Please don't bother posting if you are gonna scold me about the "shouldn't have bought a wrangler if you wanted good gas mileage blah blah blah blah", I AM WELL AWARE.

wooaaaa hey woooooaaaaa, pump your breaks......I don't think anyone was busting your gonads in a "scolding" manner.......:wavey:
Of CORSE you are going to get that response from someone.
My response to you is if you are such an "expert" and this isn't your "first rodeo" then why ask the question????

ncossey 09-30-2010 11:32 PM

Quote:

Originally Posted by daggo66 (Post 796539)
Easy Francis.

You take it easy Sally. What happened to your profile pic btw, the picture of your maroon jk was much better :D

ESP 09-30-2010 11:33 PM

Also I've been reading a lot about how the 3.8 works better when it shifts around 2700 not 2200. You might check into that or try it out for a tank or so and see if it improves for you. I know that my shifting is the smoothest at that RPM with my JK's manual tranny so I give it a thumbs up. :) Smoother shifting equals less clutch slippage and over revving that eats into MPG. Is yours and auto or stick?

HansB 09-30-2010 11:33 PM

Ncossey...I experience about the same as you on a regular basis. I've got a 2010 4dr unlimited, 6-spd with 33's and a 2.5" lift and get in the 230-260 miles per tank. What I've noticed is that if I drive 55-60 mph on the freeway and don't accelerate quickly (crawl to speed in other words) I'll get more in the 16-19 range. That being said, I enjoy driving and my idea of fun driving is not crawling to speed. I like to do things quickly so my mileage is more like 12-14. I won't get the 16-19 range doing 75-80 on the highway, especially in NJ/NY/PA where it's not all flat. I've always had a heavy foot and have never gotten as good gas mileage figures as advertised or even what other folks get. For example, when my dad drove his car, he'd get 25+ mpg. When I drove his car, I'd be lucky to get 17 mpg. Same vehicle, same gas, same roads being driven. Just different driving styles.

I'm having the RIPP Supercharger/Intercooler/Headers put in so I'll let you know if the mileage increases as it's supposed to!

InfernoGirl 09-30-2010 11:34 PM

Quote:

Originally Posted by ncossey (Post 796351)
How many miles on average are you guys getting to a tank of gas, because my wrangler is getting complete garbage. I am running 33 a/ts with 2 inch spacer lift. I generally stay around 65-70 on the interstate and never break 2200 rpms, and yet I am getting way less than 120 miles to a half tank of gas. 07 wrangler 2 door, no lights on the dash btw, and this is with a/c off. Any ideas, clogged injectors? Bad 02 sensor, someone please help me I know I am supposed to get bad gas mileage but this is just rediculous.

You can't base your calculations on the gas gauge, at least not till it's empty. Do the math. It isn't that hard. Have you corrected the speedo for the tire size, it is slightly off, as is the odo, giving you incorrect readings to figure your calculations.

Edit: I posted this before I read all the replies. My only response now is AAAAAAAAAAARRRRRRRRRRRRRGH!

Learn how to figure mileage! It isn't hard. REALLY! Gas gauges are notoriously inaccurate till the end. (Ever notice how the first half tank of gas seems to last quite a while, but the second half goes in no time?) Computers don't always tell the truth, either, although ours has been fairly accurate when refilling the tank. But you can't just look down at the computer coasting down a hill and see that it says 23mpg, when you aren't consuming much gas, and assume that that is the mileage you are getting all day long......

Schwheelz 09-30-2010 11:34 PM

Ive also heard driving with your windows up is more efficient on the highway because windows down ruin your aerodynamics... Wait a minute, we drive bricks there are no aerodynamics.

Well you could always try a chip to increase your air/fuel ratio to get more bang for your buck :)

ncossey 09-30-2010 11:35 PM

Quote:


I'm having the RIPP Supercharger/Intercooler/Headers put in so I'll let you know if the mileage increases as it's supposed to!
What are you paying for that including labor, if you don't mind me asking.

ncossey 09-30-2010 11:36 PM

Quote:

Originally Posted by Schwheelz (Post 796561)
Ive also heard driving with your windows up is more efficient on the highway because windows down ruin your aerodynamics... Wait a minute, we drive bricks there are no aerodynamics.

Well you could always try a chip to increase your air/fuel ratio to get more bang for your buck :)


Hey man are you coming out to Hot springs this weekend for the fall fest at Superlift? Its gonna be a good time.

daggo66 09-30-2010 11:37 PM

Quote:

Originally Posted by InfernoGirl (Post 796559)
You can't base your calculations on the gas gauge, at least not till it's empty. Do the math. It isn't that hard. Have you corrected the speedo for the tire size, it is slightly off, as is the odo, giving you incorrect readings to figure your calculations.


Very good point. If he hasn't corrected his speedo, none of the math works.

ncossey 09-30-2010 11:38 PM

Quote:

Originally Posted by InfernoGirl (Post 796559)
You can't base your calculations on the gas gauge, at least not till it's empty. Do the math. It isn't that hard. Have you corrected the speedo for the tire size, it is slightly off, as is the odo, giving you incorrect readings to figure your calculations.


True, but you can refill your tank whenever you want, and take the gallons that it takes to refill it and divide that by how many miles you traveled. It's actually more accurate to do it that way than when your light comes on, because almost all vehicles made today (ESPECIALLY CHRYSLER) leave about 3-4 gallons in the bottom of the tank that is inaccessible. I really hated my first truck, 2001 dodge ram, had a 26 gallon tank and I could only use about 20 gallons of it.

Schwheelz 09-30-2010 11:38 PM

I used to drive my jeep around 3000-3500 rpm's but now im goin at about 1200-2300 whenever I'm driving on a regular day and I have MUCH better gas mileage

Schwheelz 09-30-2010 11:39 PM

Quote:

Originally Posted by ncossey

Hey man are you coming out to Hot springs this weekend for the fall fest at Superlift? Its gonna be a good time.

Where is it exactly?

HansB 09-30-2010 11:40 PM

Can't really say, other than I got a great deal because they were looking for a 6-spd to document, put on the website, you-tube, dyno, etc. I'll be without my jeep for a bit (hopefully no more than 2 weeks or so) while they do all their work, but it'll be worth it!


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