|07-25-2008 01:13 PM|
I would stop adding to it...just for you.. although I am just advocating about if it worth keeping a jeep with bad milage.. although I am not selling mines..
|07-25-2008 10:34 AM|
Could a MOD Split this thread? I'd like to follow Tobycats progress, bpowa's issue could be another thread.
Please feel free to delete this post either way.
|07-25-2008 04:58 AM|
|07-25-2008 04:15 AM|
|07-24-2008 10:22 PM|
|tobycat1||The result is in! 15mpg, thats a 3.5 mpg increase|
|07-24-2008 06:18 PM|
|Rawkon||how are all your gear fluids and air filter?|
|07-24-2008 05:58 PM|
i seafoamed it. its has 50k.
toby the cheap obd 2 scanner only reads check engine codes.. it only reads it when it totally fails.
|07-24-2008 05:15 PM|
|07-24-2008 05:13 PM|
'99 TJ SE 5 speed. 79k miles, bone stock. Just did a tune-up (plugs, wires, cap, and rotor). Last tank 306 miles 15.9 gallons = 19.2mpg. This was mostly on 2-lane back roads at ~45-50 mph. A lot of the time with top off.
I think the best way to increase your mileage is to ditch the top and doors.
|07-24-2008 04:48 PM|
My 1st tank of gas is at 1/4 of a tank so the initial test is almost done, Its getting at least 15 mpg, but not sure what the exact will be because my gas gauge is never quite right, and changes. When I fill up next i will see how many miles i got per gallon i put into it.
For my next test I will take out the CAI and put in the stock box with a new filter and see if it gets better mpg with that. does that need oil?
|07-24-2008 04:42 PM|
i have all new fluids in my trans tcase and axles, fresh true flow air filter and oil. also running an e fan. If you can get a thermal gun and check the temps in your exhaust that would check for restrictions. how many miles on your jeep?? i have 50k
i also sea foam my motor and fuel on a regular basis. when was your last tune up??
|07-24-2008 06:27 AM|
|07-24-2008 04:47 AM|
i added a e fan and correct speedo and now get 11.8 mpg... sigh.. i dont know what is happening.. i drive lightly 3.73 with 32'' tires..
everything is tuned up.
is there a way to check voltage from the 02 sensos to see if they are not burnt?
|07-24-2008 02:59 AM|
|tobycat1||I didnt re-do it with the 3.73, but I did the math to compensate.|
|07-23-2008 10:23 PM|
|Rawkon||just make sure you are redoing your speedo gear when changing gears or tire size. with my 33s and 3.73s and 3 speed auto with the 4.slow i average 15 to 17mpg. before i changed the speedo gear i thought i was getting much less.|
|07-23-2008 09:27 PM|
|4.0l sahara||Id like to see what the gears do for mpg.|
|07-23-2008 08:31 PM|
|07-23-2008 07:42 PM|
Sorry I should have see that too!
|07-23-2008 06:54 PM|
|07-23-2008 06:53 PM|
|07-23-2008 06:52 PM|
|07-23-2008 06:51 PM|
|07-23-2008 06:49 PM|
|AzTJ||Toby also has a 4cyl....|
|07-23-2008 06:26 PM|
|07-23-2008 06:18 PM|
JK not TJ
I have an automatic transmission 4 speed.
|07-23-2008 06:12 PM|
TobyCat1, are you sure you want to regear your TJ to 4.56 with 33" tires with your 3-speed automatic? With that transmission and tire size, I think you'd be a lot happier with 4.10 due to the really high rpms you'll get on the highway with 4.56 and 33" tires with your 3-speed automatic.
I was recently running a 5 speed transmission with 35" tires and 4.88 gearing which produced ideal highway and offroad engine rpms. But I recently converted the 5-speed to the same 3-speed transmission you have and the rpms are now excessive on the highway so I now cruise at around 60 mph, no higher than 65 at the very most if traffic won't let me go 60 mph.
My 4.88 and 35" tires produce about the same engine rpms as your 4.56 and 33" tires would so I wouldn't go 4.56 for 33" tires unless your TJ is strictly a trail Jeep like mine is pretty much becoming.
|07-23-2008 06:02 PM|
I live in West Texas so anywhere I go I have to drive is some distance.
Granted when I stay in town I don't rack up many miles.
But when I travel that is another story:
And that is with out ever leaving the state!
I drive a 2007 Jeep Wrangler Rubicon on a 2 1/2" BB Lift on 33" MTRs with the stock 4:10 rear end around town 11-12 mpg on the highway 14-15. But my list trip to El Paso I purchased the Lucas Fuel Injector Cleaner with each fill up and the trip averaged 17.85mpg for the whole trip.
This is good to know because I'm about to add the Mopar 4 1/2" long Arm Lift Kit and go to Cooper 35" tires. I know at 35" the recommended Pinion and Sun gear ratio is 4:56. SO any thing I can do to pick up MPGs I'm listening.
When I pay off my Jeep I might buy a 2009 Honda Civic for road trips that do not include wheeling, but even if gas was over $8.00/gal I would never give it up.
|07-23-2008 05:52 PM|
|bigjohnjeep||I for one appreciate you posting this thread. Most people don't "run the numbers" to see that buying a different vehicle would have to be an even swap dollar-wise to see any immediate savings in the increase in fuel mileage. Good job, dude!!|
|07-23-2008 05:38 PM|
|tobycat1||BTW, if you have anything you want tested and its within my budget, I will probably test it|
|07-23-2008 05:37 PM|
Don't ditch the Jeep thread!!!
If high gas prices have got you down, don't ditch the jeep yet! This is the thread for fuel savings and tests, I will be testing several ways to get better mpg. I will show you a couple figures
this is what you get for a trade in on a 2000 jeep with 100000 miles
Excellent - less than 5% of all vehicles
Say you sell it for 5,500, and get a brand new Corolla for 15,000. It cost you 9,500 for better mpg!
08 corolla mpg - 27/35, we'll call it 27 knowing how most people drive
00 wrangler mpg- maybe 12-20 for most, we'll call it 15.
the average vehicle is driven about 12,000 miles per year, assuming $5 per gallon on gas, you will save $1778 each year on gas. BUT, based on this info, it will take over 5 years before you investment starts to pay off, and by then you may want a new car. So stick with the Jeep and just try to make it more fuel efficient for less $$$
First off, my baseline
3.73 axle ratio
TEST #1- upgrade to 4.56 axle ratio
4.56 axle ratio
CITY MPG----- test in progress