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Old 01-03-2014, 09:24 AM   #1
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Shifting and MPG?

Does shifting have an affect on MPG?
The time you shift? 2000rpm vs 2600rpms??

When do you personally shift? Some say 2000rpms others say 2500rpms.

Does it affect your MPG?

Me personally I shift just below 2000rpms or right at 2000rpms.

Yes this is only for jeeps with manual transmissions.

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Old 01-03-2014, 09:27 AM   #2
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I forgot to add, i don't know my MPG so yea this is just asking.

For information about me. I drive a 2001 Jeep Wrangler Sahara 4.0 6cyl no lift and stock tires. Only thing not stock is my front bumper and winch, and stereo system.

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Old 01-03-2014, 09:28 AM   #3
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I usually shift around the 3000 mark. 4.0 and AX-15 with 33s and 4.10 gears.
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Old 01-03-2014, 10:03 AM   #4
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all stock, 5-speed, 3.73 factory gearing, 30" tall tires: I shift at 2,000 rpm's and manage to squeak out 17.5-18.5 mpg in all stop and go driving, I mean no driving over 50 mph and never in 5th gear I still can achieve 18 mpg on average.
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Old 01-03-2014, 12:32 PM   #5
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Mine is pretty much stock and I shift at 3,000. If I shift below 2,750ish then it lugs the engine. I think my milage is about 17 mpg.
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Old 01-03-2014, 12:48 PM   #6
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I got 11 last time I checked. 33's with a 4in. Suspension lift. 4.0L with 4.11 gears. I shift around 2300-2600
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Old 01-03-2014, 01:07 PM   #7
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I shift at 3000
I tried shifting for gas mileage once, shifted at nothing above 2400
Got worse gas mileage
So.... What's most economical shift point?
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Old 01-03-2014, 01:23 PM   #8
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The engine is most efficient around 2500 rpm. You really need to be at, or above that while driving to get the best efficiency.

Don't worry about 3000 to 4000 rpms, the engine is plenty stout enough to run there all day long.
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Old 01-03-2014, 02:21 PM   #9
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I still hold to the slowest mph in the highest gear produces the best gas mileage regardless of gearing. I don't think a jeep doing 2000 rpm could be considered working all that much harder than one doing 2500-3000. And the extra 500-1000rpm worth of fuel injection outweighs the extra volume of fuel injected with each revolution at a lower rpm
Going 50mph at 1800rpm with 33 mtrs and 4" lift for 4 hrs I was getting 19.
Typically doing 70 at 2500 rpms I get about 16-17
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Old 01-03-2014, 04:15 PM   #10
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A lot depends on tire size. It takes more rpm's to keep bigger tires turning without lugging the engine. A few years ago when I still had stock tires and gearing, I could cruise around town turning 1700-1800 rpm all day long and the Jeep was happy. If I try that with the 33's (and the regear) on there now, it just lugs the engine way down...now it's happy when it's turning 2300+.
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Old 01-03-2014, 05:57 PM   #11
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A lot depends on tire size. It takes more rpm's to keep bigger tires turning without lugging the engine. A few years ago when I still had stock tires and gearing, I could cruise around town turning 1700-1800 rpm all day long and the Jeep was happy. If I try that with the 33's (and the regear) on there now, it just lugs the engine way down...now it's happy when it's turning 2300+.
x2
33's on 4.10s here. 3in suspension lift. Original tires and 4.10s 1500+rpms was good. Now the engine grumbles at the dot just below 2k. 2000-2800 is usually the rpms I get out of each gear. Sometimes 2k-3k if I'm feeling rushed with traffic.

Getting about 15mpg with a mixture of stop and go/highway... it's a strange driving environment.
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Old 01-03-2014, 06:13 PM   #12
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33 x 12.5
I shift between 2500 - 2800 RPM's. I never run it below 2000 in the city.
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Old 01-03-2014, 06:30 PM   #13
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This is a chart that indicates rpm vs (hp/torque) curve.
2800rpm is where its at. That is where the peak Hp and Torque meet.
I find that first and second gears are too low to make it to 2800rpm. 3 and above go to 2800 nicely.
This is the rpm I get the best millage.
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Old 01-03-2014, 06:39 PM   #14
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Originally Posted by SS Adrenaline View Post
This is a chart that indicates rpm vs (hp/torque) curve.
2800rpm is where its at. That is where the peak Hp and Torque meet.
I find that first and second gears are too low to make it to 2800rpm. 3 and above go to 2800 nicely.
This is the rpm I get the best millage.
33x12.5's with 4.10s or 4.56s for my needs? - Page 2 - JeepForum.com

^

That's some good stuff too.
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Old 01-03-2014, 07:00 PM   #15
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Far better to run a gear low and rev it a bit than to lug it.
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Old 01-05-2014, 12:21 AM   #16
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Haha I believe I'm the only one to comment on this thread with the 2.5
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Old 01-05-2014, 01:44 AM   #17
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Lol I was looking for more 2.5l info myself!
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Old 01-06-2014, 01:35 PM   #18
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Quote:
Originally Posted by SS Adrenaline View Post
This is a chart that indicates rpm vs (hp/torque) curve.
2800rpm is where its at. That is where the peak Hp and Torque meet.
I find that first and second gears are too low to make it to 2800rpm. 3 and above go to 2800 nicely.
This is the rpm I get the best millage.
You realize the graph is scaled differently, right? Horsepower is calculated off of measured torque. Most any graph you encounter will have them cross at 5252 rpms. This is because the horsepower is calculated, not measured.
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Old 01-08-2014, 09:28 PM   #19
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Hell, I'm not even sure where that graph came from. Here's a couple from google images which look more appropriate.





I can only imagine the many different factors causing variation between these two tests, that isn't why I'm posting them anyways. That mspaint looking graph is very misleading. I'm not very sure about the second one here either. The first one you can follow up from the 5200rpm tick mark on the bottom and see that is approximately where the lines cross.
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Old 01-09-2014, 06:45 PM   #20
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Quote:
Originally Posted by Kokonutb View Post
Does shifting have an affect on MPG?
The time you shift? 2000rpm vs 2600rpms??

When do you personally shift? Some say 2000rpms others say 2500rpms.

Does it affect your MPG?

Me personally I shift just below 2000rpms or right at 2000rpms.

Yes this is only for jeeps with manual transmissions.

Kokonutb,

Get a little pad and a pencil, put them in a ziplock baggie in the driver's door panel and track your mileage every time you fill up: miles driven divided by gallons of gas=MPG, E.G.: 250 miles/16.3 gallons=15.3 MPG. I do this and it tells me how well I'm managing the throttle (or not), and if something is going out of whack, and you just feel something isn't right but the only thing that's different is the MPGs went south--like the #3 cyl misfire and major evap leak that recently threw codes. My MPGs went down 1+ MPG before winter blend hit the pumps, now I'm throwing codes but that's another thread.

Back on topic, my mileage in a stock '02 Sport with 5-speed tranny, 4.0 liter, 30" tires, 3:73 gears, soft top is about 16-18+ MPG (16 cty/18+ hwy) shifting ~1.2-1.5K RPM. If I skip gears and shift conservatively (900-1K RPM without lugging), sifting thru 1-3-5 (or 2-4-5 depending on terrain) I can squeak another mile+/- out of it. Winter blend gas drops me 1-2 MPG.

FWIW, the best mileage depends on several variables: engine, tranny, tires (size/width/weight),gearing, lift (I have none), weight (what, besides you and the Jeep's base weight, are you carrying--tools, recovery or other gear, groceries, et c.), terrain (dead flat, hilly, mountainous), fuel (winter blend in New England ), and the list goes on...

OTOH, my Jeep runs most efficiently in its power band, approx. 2K RPM, just a hair under 60 MPH. I once got a hair under 22 MPG hwy. (IDK--a tail wind, downhill, drafting a big truck, horoscope said it was my lucky day, AND the stars aligned?)

Clear as mud? YMMV, and invariably will...
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Old 01-09-2014, 08:49 PM   #21
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Lol I'll try that and see what happens.
Like I said, I have a 01 Sahara 4.0 6cyl 5 speed manual completely stock pretty much (stock gears, and tires that are bald haha). No tools or any added weight. Hardtop yes. I believe I have a 19 gallon tank. Haven't filled it up all the way recently so I'll have to check. Thanks for the info.
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Old 01-09-2014, 09:34 PM   #22
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I shift when it feels right & typically stay out of 5th under 45. Fuelly is great site to track your mileage.
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Old 01-10-2014, 12:30 PM   #23
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45 is the bare minimum that I'll shift into 5th, usually it's closer to 55. If I'm in steep hills, or fighting head winds, I generally won't even bother with 5th.
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Old 01-10-2014, 02:03 PM   #24
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45 is the bare minimum that I'll shift into 5th, usually it's closer to 55. If I'm in steep hills, or fighting head winds, I generally won't even bother with 5th.
x2

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