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Old 03-11-2008, 09:41 AM   #1
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Best RPM for gas mileage?

So I'm usually pretty nice to my Jeep, sometimes I spin it high but usually on the street it doesn't come above 3g. A lot of the time I find myself bogging it a little, just like 1200-1300rpm, maybe even lower. I assume that being easy on the pedal increases gas mileage, but probably only to a point. Is there an optimum RPM for gas mileage? Should I have it pretty low or more around 2000? Thanks guys

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Old 03-11-2008, 07:30 PM   #2
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different gearing means different rpms, please correct me if im wrong. but most people will be shifting gears at different rpms.

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Old 03-11-2008, 07:57 PM   #3
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my auto tranny always shifts at 1800-2500 rpm.
at 65 mph i have about 2000 rpm. and the gas mileage became much better after regearing.

with manual tranny i drove in the highest gear that was able to hold he speed.
mith the manual tranny the mileage was better than with the auto tranny.
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Old 03-11-2008, 08:03 PM   #4
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II nic how much better in gas.. I thought rubis, came with 4.10 gear.. was that the case for you? what was your standard gear?
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Old 03-11-2008, 08:09 PM   #5
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with the 3.07 gears and the 35s the 4th gear with OD wasnīt able to hold the speed at 65 mph. with the 3rd gear it was about 3000 rpm at 65 mph.
i got 12-13 mpg with that setup.

now with the 4.56 gears and the 35s i have about 2000 rpm at 65 mph.
i get 17-18 mpg with that.

in the city with stop and go traffic it goes down to 11 mpg, but most of the time itīs 13-14 mpg. before it was only 9 mpg sometimes.

with manual tranny it should be 2-3 mpg more.
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Old 03-11-2008, 08:34 PM   #6
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I'm not talking shift points but more what is the more efficient engine speed? If I am just driving and I have a choice of being in 3rd at 1800 or 4th at 1300? which one would I want to be in? I'm not sure if my question is very clear...
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Old 03-11-2008, 08:36 PM   #7
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if the engine can hold the speed in 4th with 1300 rpm this will give you a better mileage than 3rd and 1800 prm.
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Old 03-11-2008, 08:41 PM   #8
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Quote:
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if the engine can hold the speed in 4th with 1300 rpm this will give you a better mileage than 3rd and 1800 prm.
this is true to an extent, but if you're lugging the motor, your mileage will be worse.

slowing down will make more diff than anything else
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Old 03-11-2008, 08:42 PM   #9
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The most efficient rpm is around 2500 with the 4.0. With my XJ, 3:07's, LT235's, I use 4th and stay in 4th till I get above 70, after that it goes into 5th. At 60 in 5th it won't accelerate. The TJ with 2.5, 5 speed, 4:10's and 30's wants 2800, again 4th till 60ish then 5th.
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Old 03-11-2008, 08:48 PM   #10
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I had 30's with 3.73's which ran at around 2600 at 65. Now with the 33's and same gears, its at 2100 at 65. Im getting way better mileage on the highway. I have to figure out how to estimate mpgs. I would say lower rpms is better for mpg.
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Old 03-11-2008, 09:00 PM   #11
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With my rig I think the closer to 3K the better. My Rubi gets just about .5 mpg better when I run the trip home (25 miles of flat highway section) in 5'th gear instead of 6'th. Which puts it right about 2900 rpm @ 73 MPH vs 2650 RPM in 6'th gear

33's with 4.10 gearing with a manual tranny.
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Old 03-11-2008, 09:01 PM   #12
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With my rig I think the closer to 3K the better. My Rubi gets just about .5 mpg better when I run the trip home (highway section) in 5'th gear instead of 6'th. Which puts it right about 2900 rpm @ 73 MPH vs 2650 RPM in 6'th gear

33's with 4.10 gearing with a manual tranny.
Damn and I usually try to keep it under 2000. Boy was I wrong.
Thats why I posted this thread. Sounds a lot better over 2k anyways. The exhaust leaks get drowned out by the exhaust itself.
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Old 03-11-2008, 09:18 PM   #13
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i drove 100 kilomers in 3rd gear with cruise control at 65 mph with 2800 rpm and the same distanc in 4th gear at the same speed with 2000 rpm.
in 4th gear the mileage i got 17-18 mpg, in 3rd gear it was only about 13.
that was on an even highway without hills.
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Old 03-11-2008, 09:22 PM   #14
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Hmm. I'm stumped. Mixed replys.
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Old 03-11-2008, 09:25 PM   #15
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Hmm. I'm stumped. Mixed replys.
Manual vs. Auto, thats why the difference.
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Old 03-11-2008, 09:44 PM   #16
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Oh ok, makes sense. Autos must rob mileage and power. But I bet they're better on the rocks.
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Old 03-11-2008, 09:49 PM   #17
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Quote:
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But I bet they're better on the rocks.
they are also better in mud, sand, ...
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Old 03-11-2008, 09:53 PM   #18
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they are also better in mud, sand, ...
Yeah I bet that too. I guess its cool in a Jeep but in my Mustang I'd hate an auto.
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Old 03-11-2008, 09:58 PM   #19
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modern auto trannys shift better and faster than a professional driver.
my mum has a 6-spd auto tranny in her 517 hp mercedes convertible. this tranny shifts that fast you donīt really recognize it.
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Old 03-11-2008, 10:03 PM   #20
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Yeah but theres nothin like good old fashioned powershift to get the ass end squirrley.
And its just more fun driving a clutch on something like that. But in a Benz, auto for sure.
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Old 03-11-2008, 10:07 PM   #21
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itīs a small SL. and with deactivated electronic stability program the whels spin at up to 90-100 mph when you hit the gas too much.

you also have a mustang? got pics?

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Old 03-11-2008, 10:12 PM   #22
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Here it is...it has better looking wheels now, but overall doesn't look so great. Its wetsanded primer. But I'll paint it soon and then work on the motor and drivetrain and all that, In memory of my brother; he sold me the car dirt cheap cause I wanted it so bad, so I gotta make him proud.


It will look like:

Something like that but different wheels probably.
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Old 03-11-2008, 10:20 PM   #23
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youīre such a lucky guy...that young and already 2 cars...
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Old 03-11-2008, 10:21 PM   #24
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I have to say that ive driven both auto's and manuals and i will never go back to auto again! IMO manuals connect you to the vehicle so much better than auto's, plus they're a ton more fun to drive

Staying on topic, i honestly dont know...i shift at high rpms to make better power with my 2.5 4 banger and i really dont care about gas mileage...if i did care i wouldnt be driving a jeep
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Old 03-11-2008, 10:45 PM   #25
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The Mustang is just an eyesore in the driveway for a while. I need to put the driveline in it, the clutch quadrant and firewall adjuster, hook up the clutch cable, and I am missing a small wiring harness, just 2 plugs. Right now it starts from the solenoid under the hood, but not from the key, until I get that bit of wiring. Its got a bunch of back registration I need to pay, I need to smog it somehow...I've really got my hands full with that project. My brother knew every last thing about those cars, had a 500+ hp 88 Mustang with a 410 Windsor, among probably 5 other 5.0's. He was helping me with my car but then he passed so I'm kinda on my own, which is one of the reasons I've just been doing stuff on the Jeep.
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Old 03-12-2008, 03:37 PM   #26
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Yeah I bet that too. I guess its cool in a Jeep but in my Mustang I'd hate an auto.
Right on. If my coupe was dog-omatic, it would be in the crusher. Nothing like wailing on that short throw and lighting them pony's up.

About that quadrant, junk that stock plastic one and get the Steeda quadrant. I changed to the Steeda double with a Zoom cable, and all I can say is well worth the money. I may have a new quadrant and cable laying around in the shed, I'll take a look if you want.
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Old 03-12-2008, 07:49 PM   #27
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Right on. If my coupe was dog-omatic, it would be in the crusher. Nothing like wailing on that short throw and lighting them pony's up.

About that quadrant, junk that stock plastic one and get the Steeda quadrant. I changed to the Steeda double with a Zoom cable, and all I can say is well worth the money. I may have a new quadrant and cable laying around in the shed, I'll take a look if you want.
I do have an aluminum quadrant, and a new cable already, just gotta throw em on. But I don't know how. Thanks for the offer though on the quadrant and cable. My brother had a friend who was good with these cars too, I think I'll give him a call and ask if he could maybe help me out getting it running and driving.
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Old 03-12-2008, 08:33 PM   #28
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just to add to the original post, with my 4.0 and manual, i leave it at about 1500, to 2000, then when i want to accelerate i downshift, this is probably more work than most people like, but i find its the best for gas mileage, but i shift like once every 40 seconds when in traffic or more, i find the best cruising RPM is about 1900 and the best accelerating RPM is about 2800
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Old 03-12-2008, 08:36 PM   #29
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Quote:
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the best accelerating RPM is about 2800
x2

the 4.0L has itīs maximum torque at 2700 rmp.
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Old 03-12-2008, 08:38 PM   #30
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wow i cant believe i nailed that from driving and noticing it haha

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