mpg question - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ General Discussion Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 07-11-2010, 10:12 PM   #1
Jeeper
 
djw97tj's Avatar
 
Join Date: Jun 2010
Location: Castalia, N.C.
Posts: 304
mpg question

so i took the jeep down the interstate we had the safari top on and it was great except that i had to kinda fight to keep it between 60 and 65..the speed limit was 70 lmao. the reason i didnt "fight" more and get it to or closer to 70 was the rpms were almost at 3000, didnt know if that was too "hard" on it and really didnt want to experiment with it. so i was telling a friend and he was like "what?! it was only around 3 at 60-65 thats great for gas mileage!" so i was wondering if thats true
thanks

djw97tj is offline   Quote Quick Reply
Old 07-11-2010, 10:12 PM   #2
Jeeper
 
djw97tj's Avatar
 
Join Date: Jun 2010
Location: Castalia, N.C.
Posts: 304
btw its a 2.5, forgot to add that

djw97tj is offline   Quote Quick Reply
Old 07-11-2010, 11:06 PM   #3
Moderator

WF Supporting Member
::WF Moderator::
 
doclouie's Avatar
 
Join Date: Feb 2010
Location: In the mountains.
Posts: 3,656
Images: 4
Yea your friend was being sarcastic. 3000 RPM at 65 is quite high which means it will eat up a lot of gas. The higher the RPMs the more gas it will eat. I know when I cruise I am always above 3000 RPMs, but I do have the straight 6. There is no problem maintaining a higher RPM constantly when you are driving as long as the engine does not overheat, but that is normally not a problem. Just keep it out of the red line area on the tach and you will be fine.
__________________
2000 Sahara, 3.5" Rubicon Express Lift, 1" spring spacer & 1" Body Lift, 33" or 35" BFG Mud tires, Front & Rear ARB, Rancho 9000 shocks, UCF Ultra High Belly Up

doclouie is online now   Quote Quick Reply
Old 07-11-2010, 11:39 PM   #4
Show Me Your 8008135!

WF Supporting Member
 
s3nt3nc3d's Avatar
 
Join Date: Oct 2009
Location: Piqua, OH
Posts: 3,642
Send a message via AIM to s3nt3nc3d
Crap! At 3000 RPMs with my 4.0 it feels like it's winding out... redline's at like 5200 or something but theres no way in hell I'll take it anywhere close to that. I usually shift between 2000 and 3000 RPMs and cruising on the interstate in 5th gear I'm usually around 2200 RPMs or so...maybe just under 3000 when doing 80 mph on the faster interstates.

And I agree...cruising at 3000 RPMs on the highway definitely is not good for gas mileage in a Jeep, though if your RPMs are TOO low, that's also not good because a lugging engine will suck a lot of gas too.
__________________
"We don't build great brakes because we think you don't know how to drive, we build them for the guy on the road in front of you that doesn't." - Black Magic Brakes
s3nt3nc3d is offline   Quote Quick Reply
Old 07-12-2010, 12:39 AM   #5
Newb
 
Rian306's Avatar
 
Join Date: Jul 2010
Location: Hershey PA.
Posts: 5
Exclamation

Yes actualy it is okay and pretty good.

The engine doesn't start making good power until it hits at least 2500 rpm. These little engines can run at 3500 rpm all day long, but I wouldn't sustain much more than that.

Chart AMC 150/2.5 Compression Horsepower Torque
One-barrel carburetor 9.2:1 105 hp (78 kW) @5000 132 lbft (179 Nm) @2800
Throttle body injection (TBI) 9.2:1 117 hp (87 kW) @5000 135 lbft (183 Nm) @3500
Multi-point fuel injection (MPFI) 9.1:1 120 hp (89 kW) @5250 139 lbft (188 Nm) @3250

Torque is the one you want
I have a 1991 2.5 TBI and its actual a XJ engine designed for an automatic tranny so the rev. is super high to make power. Third gear is the god gear. I can go faster in third gear then in any other gear, i hit about 85mph at 3500 RPM flat surface. Note: i do have a 4.0L TBI and cheap old cold air 31inch tires and stock everything else.

Link with more help for the 2.5 guys to gain more power. 2.5 Jeep AMC engine
Rian306 is offline   Quote Quick Reply
Old 07-12-2010, 04:38 AM   #6
Jeeper
 
cabin_guy's Avatar
 
Join Date: Jun 2010
Location: In the woods, Muskoka Ontario
Posts: 41
Images: 2
Of course tire size and gearing will affect what you rev at any given speed.

my 4.0 with 3.73 gears and 30 inch tires revs about 2200 at 65 mph and you can feel the power band really kick in around 2300 or so.
cabin_guy is offline   Quote Quick Reply
Old 07-12-2010, 05:15 AM   #7
Newb
 
Rian306's Avatar
 
Join Date: Jul 2010
Location: Hershey PA.
Posts: 5
true gearing dose matter, especialy with tire size but he is talking about a 2.5l so 4.0 guys get out of here.

I usally keep my 2.5l jeep around 65-70 on the highway. 27-31 RPM in any gear on highway is not bad on a 2.5 infact it is where you should be for the best fuel milage in 5 th gear at cruising speed.

You should be shifting properly too for fuel econemy you want to shift from 21-24 for city driving.

JP magazine did an artical on the best MPG Jeep from MB-TJ. And do you know what that was. the 1991 Jeep stock wrangle. thats right they got 19-21 MPG. but stock is no fun. next was the 92-96 stock YJ.

I couldn't find that artical but i did find another fuel milelage one and as everyone knows the biggest diffrence in fuel econemy, has to do with your tires. the right size and inflated to the proprer PSI for street driving. link

__________________
_______
/l ,[____], BUDDY: Says Real jeeps have Round
l----L--[]lllllll[]- head lights, I Repley:
()_) ()_)--o--)_) REAL JEEPS HAVE LEAF SPRINGS

"I know i can get my girl topless and wet every day!"
Rian306 is offline   Quote Quick Reply
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
6sp shift question rico334 TJ Tech Forum 15 12-13-2009 09:08 PM
Shock instal question gerb04 TJ Tech Forum 9 12-01-2009 10:06 PM
quick axle question Sb5551 TJ Tech Forum 3 10-03-2008 08:38 PM
Trans Mount Question MOz TJ Tech Forum 8 06-10-2008 03:14 PM
Carb question and EGR question trulefty YJ Tech Forum 0 12-12-2006 04:55 PM


logo carid shop wrangler parts carid fender flares custom wheels store avs deflectors at carid
» Rates
Get low rates on auto insurance in Canada!

» Network Links
»Jeep Parts
» Featured Product

All times are GMT -5. The time now is 05:29 PM.



Jeep, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC