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Topic Review (Newest First)
09-20-2011 01:46 PM
AmericaOverland I got back from my 3,200 mi trip to OH through 8 states, and this is what I found.

Driving at 60 MPH got me around 17.5 to 18.5 MPG, and driving at 67 got me at 19-20 MPG consistently.

I need to check city mileage again because I had a vacuum boot that was aging and not giving me accurate air control, apparently, and it finally came off across the street from a jeeper family's house in TN (Kate and Dick).
08-29-2011 01:56 PM
Mikekaz1 I just did a test. On 4.6 miles gps my odo said 4.4.
08-29-2011 11:13 AM
GoldenSahara00 Thats the idea
08-29-2011 09:18 AM
Mikekaz1
Quote:
Originally Posted by GoldenSahara00

you can use mapquest for a rough estimate if your doing a road thats pretty obvious, otherwise it gets annoying trying to set up the route correctly.
Hmm I'll try that. Just straight up and down a decent long road and test the difference.
08-29-2011 07:37 AM
GoldenSahara00
Quote:
Originally Posted by Mikekaz1 View Post
Hmmm. I have to get a gps first haha. But that's a good idea I might try that

you can use mapquest for a rough estimate if your doing a road thats pretty obvious, otherwise it gets annoying trying to set up the route correctly.
08-29-2011 04:55 AM
00tj2 Can't go by the gauge. Sometimes I'm in the red and can only put 14 gallons in. That means I have around 4 gallons left in the tank. Other times it shows just over the red and I can put 16 gallons in. Have to use you odom to get the best reading..
08-28-2011 10:02 AM
Mikekaz1
Quote:
Originally Posted by GoldenSahara00
Thats awful. lol.

14.5 is my low with I believe the exact same setup as you. maybe you should take your mirrors off thats what I did...

have you ever compared your odo to gps miles? just for the heck of it? I did and discovered mine was off by alot more than just what happened because of tire size. I Have to divice my miles by .71 to find actually miles, so they are about 1/3 off. It says I get around 10 to the gallon. so, it might be worth a shot.
Hmmm. I have to get a gps first haha. But that's a good idea I might try that
08-28-2011 09:26 AM
AmericaOverland Wow, that sucked a little. I put in some more gas early this morning after the light came on again. just a little over 13 MPG... I did baby the accelerator, thinking that the less I gun the acceleration to speed, the more gas I save. The problem is high revs over a longer distance would probably yield a larger number of total revs than a moderately high rev over a shorter distance. I would have to try that next and see... I had wondered why I was getting lower numbers in my Honda CR-V. It wasn't too much an issue in the cheap-to-drive Corolla I had before that, but I started to notice it in the CR-V and really notice it in the Jeep.

Now, one question... Yesterday afternoon, I parked the jeep at home in 105 degree weather, and this morning it was about 85 or so. I noticed that the gas needle was just above the red line yesterday, and when I got in this morning, the needle was sitting a bit inside the red line. Is it because the gas contracted in response to temperature? I HOPE so, otherwise my gas is venting out somewhere, but I don't smell anything, and I haven't seen any gas leaking out onto the ground.
08-28-2011 12:04 AM
00tj2 good gas milage and a smooth ride in a jeep are as mystical as finding a unicorn... haha...jaank, you had me laughing
08-27-2011 11:14 PM
herbie simple formula the more you open the throttle plate the more gas you use and the sooner you let off the gas the less gas you use. driveing with a light foot and reduced speed make the most difference
08-27-2011 10:44 PM
GoldenSahara00 Thats awful. lol.

14.5 is my low with I believe the exact same setup as you. maybe you should take your mirrors off thats what I did...

have you ever compared your odo to gps miles? just for the heck of it? I did and discovered mine was off by alot more than just what happened because of tire size. I Have to divice my miles by .71 to find actually miles, so they are about 1/3 off. It says I get around 10 to the gallon. so, it might be worth a shot.
08-27-2011 10:27 PM
Mikekaz1
Quote:
Originally Posted by GoldenSahara00
roughly 6%. so you get about 1 mpg better than you think. roughly.
So I've maxed out at 14.5 mpg. And average about 11 in that sense.
08-27-2011 09:51 PM
jeeperharmon
Quote:
Originally Posted by immarkshy
i get best gas mileage at around 1.21 jiggawatts... but thats just my jeep
Idk where u come from but its not like I can go to the corner store and buy plutonium off the shelf
08-27-2011 09:43 PM
GoldenSahara00
Quote:
Originally Posted by Mikekaz1 View Post
Well my lil sticker on the door jam said it came with 30" wheels. (Sahara edition thing idk?). So the 2" shouldn't be that drastic of a mph drop.
roughly 6%. so you get about 1 mpg better than you think. roughly.
08-27-2011 07:16 PM
jrussblues
Quote:
Originally Posted by immarkshy
i get best gas mileage at around 1.21 jiggawatts... but thats just my jeep
Oh yeah!
08-27-2011 05:13 PM
immarkshy i get best gas mileage at around 1.21 jiggawatts... but thats just my jeep
08-27-2011 05:04 PM
neverfastenough1
Quote:
Originally Posted by ipleadda2nd View Post
It's been a while since my Newtonian physics course, but I'm fairly certain the faster you accelerate the more power is needed.

Force = Mass * Acceleration

Your mass is constant. As acceleration goes up, the force is increased. Since the force your engine outputs comes from the energy in gas, you would burn more gas.
True, and your engine has different power levels at different rpm's which means it works less at certain rpms. And the quicker you get to that certain speed, the sooner you can ease off the skinny pedal. Definately not cost effective to floor it every gear, but just the same, its not cost effective to baby it either from gear to gear. Like someone said already, no matter how I do it in my Jeep, I get about the same fuel economy, or lack of. Now in my Mustang, I can really tell the difference in my pocket. My Jeep with 33's is about 1 mile off every 10 miles. Meaning when my odometer clicks nine miles the vehicle has traveled approximately 10.
08-27-2011 04:57 PM
Jerry Bransford Worrying about what is the optimal acceleration rate for a Jeep?

Shakespeare expressed my thoughts precisely when he penned the comedic play "Much ado about nothing". Analysis paralysis comes to mind too.
08-27-2011 04:36 PM
Mikekaz1
Quote:
Originally Posted by GoldenSahara00
you need to realise that your odometer is off by a certain percentage because you went from 28 to 32 inch tires.
Well my lil sticker on the door jam said it came with 30" wheels. (Sahara edition thing idk?). So the 2" shouldn't be that drastic of a mph drop.
08-27-2011 03:10 PM
ipleadda2nd It's been a while since my Newtonian physics course, but I'm fairly certain the faster you accelerate the more power is needed.

Force = Mass * Acceleration

Your mass is constant. As acceleration goes up, the force is increased. Since the force your engine outputs comes from the energy in gas, you would burn more gas.
08-27-2011 03:00 PM
bighog85
Quote:
Originally Posted by neverfastenough1 View Post
Yep if your speedo isn't right, your odo isn't either. You'll be getting better gas mileage than you think because you are traveling further than your odo says.
Yup, most people don't realize that. I get over 18 mpg average with my 4.0, auto with 33s. I drive very slowly though and probably piss a lot of people off that get stuck behind me at a stop. I actually do a little better than that because I have not changed the gear on my speedo so I am going farther that what the numbers say.
08-27-2011 02:21 PM
neverfastenough1 Yep if your speedo isn't right, your odo isn't either. You'll be getting better gas mileage than you think because you are traveling further than your odo says.
08-27-2011 01:23 PM
GoldenSahara00 you need to realise that your odometer is off by a certain percentage because you went from 28 to 32 inch tires.
08-27-2011 01:18 PM
Mikekaz1
Quote:
Originally Posted by GoldenSahara00
I can do 65 in 2nd...

mike kaz, You have the 4.0? are you calculating your mpgs according to your tire sizez change?
Yes I have the 4.0. I'm calculating by the miles per tank I'm getting and then dividing it down to gallon
08-27-2011 10:19 AM
GoldenSahara00 I can do 65 in 2nd...

mike kaz, You have the 4.0? are you calculating your mpgs according to your tire sizez change?
08-27-2011 09:10 AM
neverfastenough1
Quote:
Originally Posted by AC0QR View Post
Don't floor it, because then the ECU will run rich, in open-loop mode. And this will use more gas.
Yep, mine runs rich 90% of the time. I am 45 going on 16.
08-27-2011 07:33 AM
InvertChaos
Quote:
Originally Posted by jaank
in all seriousness in my 2000 TJ I am not very gentle, shift around 3k, don't go to 5th unless exceeding 45mph, and am pretty generous with the skinny pedal, and I get 14-15mpg, almost all in town driving.
Darn I was hoping to see a video of you hitting 70mph in 2nd lol
08-27-2011 01:15 AM
jaank in all seriousness in my 2000 TJ I am not very gentle, shift around 3k, don't go to 5th unless exceeding 45mph, and am pretty generous with the skinny pedal, and I get 14-15mpg, almost all in town driving.
08-27-2011 12:39 AM
Mikekaz1 Idk but I get awful gas mileage too. On a good day 12-13. And I don't run over 2000 rpm at any one time. I have an 3speed auto with 3.08's and 32" curious how your all getting 15+ on a bad day
08-26-2011 11:11 PM
InvertChaos
Quote:
Originally Posted by jaank
i usually floor it in first until about 4.5k, then shift to second. I don't let up on the gas while I shift however, so once 2nd engages my wheels give the person next to me confirmation of what they think they are hearing from my engine. I don't use gears 3-5.
Video or it didn't happen
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