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Old 10-06-2010, 08:43 PM   #1
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12mpg!?

I have a 97 automatic with the 2.5l and just figured out I am only getting 12mpg city. Everything is stock, and I just replaced the plugs and wires. It only has 92000 miles on it. What could be killing the gas mileage or is expecting 16mpg too much?

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Old 10-06-2010, 08:46 PM   #2
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Well, thats kinda low im comparison to my 99 2.5

My trip was reset on my last tank, but the tank before that (new to me jeep and only gone through 2 tanks so far) i averaged 19 mpg...I do have a manual and 65k on the clock but i wouldnt think those would make that big of a difference.

I'm sure others will chime in here with a better/actual answer...sorry man!

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Old 10-06-2010, 08:50 PM   #3
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I am using an app on my phone to make my calculations, maybe that is doing something wrong. I'll double check my numbers. I do know I need to clean my idle air intake, but I can't see that being the whole problem
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Old 10-06-2010, 08:53 PM   #4
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Well the torque converter takes more gas, but i mean it's a jeep. Welcome to the club haha
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Old 10-06-2010, 08:53 PM   #5
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No clue what the app is on the phone, so on your next tank just reset your trip and divide that mileage by how much gas you put in on the next fillup (which i'm sure you already knew)...that'll give you your number!
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Old 10-06-2010, 08:54 PM   #6
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Stock tire size? Check your #'s and report back.
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Old 10-06-2010, 08:54 PM   #7
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i was expecting it to be low, but 12mpg on a 4 bangger? thats just nuts
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Old 10-06-2010, 08:55 PM   #8
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My 2.5 5 spd. Was getting right around 21 city last time I calculated. I have a aftermarket ignition coil, headers, and exhaust, 8mm wires as well. It tends to get a little better in the winter. And that 21 mpg calculation was done mid july.
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Old 10-06-2010, 08:56 PM   #9
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they are P215/75/15'S
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Old 10-06-2010, 08:56 PM   #10
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Quote:
Originally Posted by briancash1013 View Post
I have a 97 automatic with the 2.5l and just figured out I am only getting 12mpg city. Everything is stock, and I just replaced the plugs and wires. It only has 92000 miles on it. What could be killing the gas mileage or is expecting 16mpg too much?
That's not uncommon. The 4cyl is underpowered for a Jeep. The 4.0L I6 will get much better mileage because it has enough power to pull the Jeep without straining (if it is geared correctly). The automatic is the other problem. The automatic transmissions in 1997~2002 TJs are 3 speed automatics. That means 1:1 ratio is the best you're going to do. In the manual, you have an overdrive gear; but with the 4cyl, this doesn't help that much. Speed is a big factor, especially if you have modified the Jeep. Slow down and don't hammer on the gas when starting off.
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Old 10-06-2010, 09:21 PM   #11
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I get around 13MPG in my stock 5sp, 2.5L. I'm running P265/75 R15, which are a little bigger than 31" tires.
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Old 10-06-2010, 09:30 PM   #12
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No clue what the app is on the phone, so on your next tank just reset your trip and divide that mileage by how much gas you put in on the next fillup (which i'm sure you already knew)...that'll give you your number!
Calculator???
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Old 10-06-2010, 09:34 PM   #13
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Considering calculators are on all cell phones right out of the box...i'm gessin he wouldnt of said "app" if it was just a normal calculator.
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Old 10-06-2010, 09:35 PM   #14
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It's called accufuel it is suppose to track the data for me so I'm not trying to remember what I was getting last month. Anyone else have a 4 banger automatic that I could compare with?
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Old 10-06-2010, 10:25 PM   #15
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I think the problem might be that Iphone!!!!!!
Worst phone ever, specially that 4g. well no disrespect to anyone just my opinion!!!
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Old 10-06-2010, 10:28 PM   #16
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I get about 15.2 mpg. Stock everything. Manual, 2006, 4.0. Sucks, but it's well worth it because I LOVE IT!
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Old 10-06-2010, 11:05 PM   #17
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I have the 2.5 auto, with 31in tire 12.5. With 33in tires 10.5 to 11.5! The price we pay for things we love!
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Old 10-07-2010, 12:21 AM   #18
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Quote:
Originally Posted by briancash1013 View Post
I have a 97 automatic with the 2.5l and just figured out I am only getting 12mpg city. Everything is stock, and I just replaced the plugs and wires. It only has 92000 miles on it. What could be killing the gas mileage or is expecting 16mpg too much?
You're probably doing your calculations wrong, or there is a problem. That's quite low for a stock rig. I get about 12.5 mpg (3-Speed Auto, 4.0 I6) - with 5.25" of lift, 35x12.5" tires and a parachute (err roof rack).
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Old 10-07-2010, 03:29 AM   #19
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yeah I get 15-17 on 4 inches of lift and 33 in tires 4.0 auto. Could be how you drive also. I try to use low rpms whenever possible....
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Old 10-07-2010, 05:33 AM   #20
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I think the problem might be that Iphone!!!!!!
Worst phone ever, specially that 4g. well no disrespect to anyone just my opinion!!!
There's about 100 million people who disagree with that statement, nothing like strength in numbers. You must be an android (L)user.
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Old 10-07-2010, 08:32 AM   #21
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97 2.5L auto, 3.73 gears running on 31x10.50 sneakers, 2"BB, upper 13's here. Thats after complete tuneup.
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Old 10-07-2010, 10:47 AM   #22
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There's about 100 million people who disagree with that statement, nothing like strength in numbers. You must be an android (L)user.
android is equal with the iphone in sales. Its WAY better (att sucks too)

I got 8 mpg on a 100% freeway drive. Top down, strong head wind, steep grade, and 75 mph! Loved every minute of it.
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Old 10-07-2010, 10:49 AM   #23
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Is your speedometer/odometer accurate?
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Old 10-07-2010, 10:58 AM   #24
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4G? At&t won't be 4G until at least 2012....they are still trying to lobby for the fcc license to construct it. Verizon already holds all the licenses and is constructing
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Old 10-07-2010, 05:28 PM   #25
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Is your speedometer/odometer accurate?
As far as I can tell yes. Could a dirty IAC be some of the problem, I have tried to clean it but can't find it, I'm not really good with engines
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Old 10-07-2010, 05:35 PM   #26
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I have read that bad O2 sensors can cause sudden decrease in MPG.
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Old 10-07-2010, 05:39 PM   #27
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yep they will because they are reading wrong and telling the ecm to dump more gas
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Old 10-07-2010, 05:50 PM   #28
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But wouldn't an O2 sensor show a code?
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Old 10-07-2010, 05:52 PM   #29
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It should yes...but if its intermittant it might not record it...happened to me a few times on my mustang
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Old 10-07-2010, 05:56 PM   #30
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It should yes...but if its intermittant it might not record it...happened to me a few times on my mustang
+1. Sometimes they can be 25% off before they will throw a code. Old O2 sensors get "lazy" and do not react as fast, or as accurately. They should be changed at least every 50K mi. Always buy the oem sensors and not cheap knock offs because the cheapos do not work as well.

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