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Old 01-18-2013, 02:41 AM   #1
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18mpg on the hunt for more

Hey guys
99 Sahara tj 4.0 auto hardtop stock gears
31" tires were thrown on by PO
As soon as I got the thing, I was on the hunt for better gas mileage. Currently my only other drivable car is a 940hp street mustang that gets the most laughable gas mileage. In fact, my license plate says "MPG LOL". I was sad when I heard the mileage these jeeps get, but I didn't let that stop me.

For weight reduction, I removed:
Side steps (long versions that go from tire to tire)
Firewall to grill bracing
Sun visors
Front bumper jugs and bump pads

It might not have done much, but they have secondary purposes for removing so it was worth it to me.

For efficiency increases, I:
Replaced exhaust from front to back. Tube header to magnaflow cat and dynomax catback with 2 new bosch o2 sensors
Replaced gear, tranny, tc fluids with amsoil (and tranny filter)
Replaced spark plugs with Bosch v-power and replaced spark plug wires since most disintegrated when I pulled them off
(Cap, rotor and coil are getting replaced next week)
Slapped on a cheap eBay cold air intake. Its a pipe with a cone filter. Nothing fancy. Cost like $70 shipped.
Ported and cleaned intake manifold
Unshrouded and cleaned injector bosses
Replaced injectors with my stock low-mile 2010 mustang gt injectors.
Ported and heavily cleaned intake and exhaust runners in head.
Ported throttle body to around 68mm and unshrouded and cleaned IAC venturi area.
Unshrouded throttle mount on intake manifold.
Replaced all battery cables and engine grounds with fresh cables and connectors.
Amsoil p.i to help clean upper cylinder zone.
Installed new 180amp alternator.
Installed new battery, class 34 I believe. One of the biggest I could fit.
(Will put in amsoil signature oil once fresh looking oil currently in motor looks less fresh)

I'm probably going to do the electric fan thing next, but besides that, I'm not sure what to do next. I got 18.3 MPG going about 64mph on the highway. I persuaded the pump to keep going until I hit 9 gallons on the dot, and it had been 165 miles since my initial fill up which was also to the brim.

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Old 01-18-2013, 03:27 AM   #2
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If you want more MPG, you bought the wrong truck.

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Old 01-18-2013, 03:34 AM   #3
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Just keep it full of fuel and you'll have no problem...
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Old 01-18-2013, 05:32 AM   #4
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Would be interesting to figure out how much money you've put into picking up 3 mpg and see how long it will take to recover that cost. Sounds like a lot of what you've done was required maintenance, but I wouldn't throw thousands of dollars into trying to save hundreds at the gas station.
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Old 01-18-2013, 05:58 AM   #5
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Lot of time, effort, and money for negligible gains. My best mod was to start driving like an old lady. 17 mpg as if it really matters
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Old 01-18-2013, 06:19 AM   #6
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Why don't you just buy a freaking civic. Sorry but I'm tired of reading these MPG posts. You basically threw away the price of the jeep and every mod you made for nothing.(since your goal is better MPG on a vehicle that you already knew didn't get good MPG) Do you really think removing structural supports that weigh what, 2 pounds and you visors that weigh all of ounces each, is going to reduce you weight that much??? It's not a race car, it's a jeep that is shaped like a brick. On that note if you come up with any real world solutions to increase your MPG please pass them on. Btw your stang sounds awesome, can't wait till I get one again.
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Old 01-18-2013, 07:03 AM   #7
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My 04 4 cyl gets 18-19 when I drive it like the old man I am. Once I use my right foot too much and try to keep up with traffic it just gets worse and worse. But I accept that and know nothing will improve it other than a Prius. You cannot have fun and get good MPG. I am surprised how many automotive engineers there are on this forum that think they can improve the fuel economy. Don't they think Chrysler wants to improve it and they spend more money than these wannabes without any success.
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Old 01-18-2013, 07:16 AM   #8
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I got 19.995 MPG on a trip to Fall Creek Falls State Park last weekend with my '99 I-6, 5 speed Sahara. Got 16,644 MPG driving it to work this week. I'm happy with both numbers! Probably got about 12 MPG driving in 4 wheel high yeasterday and this morning driving in snow and ice. Still smiling!
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Old 01-18-2013, 07:27 AM   #9
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MY 06 X gets on average about 14mpg
My 10 Civic get's about 34.

Civic goes to work
Jeep goes for fun.

Problem solved.
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Old 01-18-2013, 07:40 AM   #10
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I'm supprised you haven't taken the back seat out for weight savings. And you personally could probably loose more weight than you removed from your vehicle... that would help too... Crash diet for MPG's...
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Old 01-18-2013, 07:50 AM   #11
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I wonder what will happen first...
A) Engine will suffer harmful damage from cheap ass air filter

B) Grill/ fenders will start cracking due to removed support grill supports.
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Old 01-18-2013, 08:12 AM   #12
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Quote:
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I'm supprised you haven't taken the back seat out for weight savings. And you personally could probably loose more weight than you removed from your vehicle... that would help too... Crash diet for MPG's...
Why doesn't he use milk crates instead of the front seats. And never have more than a few gallons of gas in the tank also, 15 gallons weighs a lot.
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Old 01-18-2013, 08:15 AM   #13
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I'm curious what an analysis would show regarding a timeframe for your MPG savings to balance with your parts/time expenditure.
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Old 01-18-2013, 08:30 AM   #14
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You removed the:

Quote:
Firewall to grill bracing
That bracing is there for a reason - I suggest you put it back.
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Old 01-18-2013, 08:30 AM   #15
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Quote:
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I'm curious what an analysis would show regarding a timeframe for your MPG savings to balance with your parts/time expenditure.

It's curiosity like yours that kill money saving exercises like this.

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Old 01-18-2013, 08:38 AM   #16
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The largest improvement I saw was breaking the 20 mpg mark on flat open highway with ethanol free fuel in the scenario of 33"s, 3:73's, 42RLE, stock airbox, with EVERYTHING still installed plus about 200 lbs worth of seabags and tools in the back. There's no need to start removing integral parts of your vehicle to make an attempt at saving pennies. That's how turds are formed.
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Old 01-18-2013, 08:57 AM   #17
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I hear Jeep's don't like Bosch parts O.o

MPG should be a concern when you choose a Jeep
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Old 01-18-2013, 09:02 AM   #18
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I have nothing to add to this post but since you are parting out the Jeep, just shoot me a PM if you want to sell the visors.
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Old 01-18-2013, 09:19 AM   #19
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I now own a 99 TJ 2.5 with 4" suspension lift and 2" body lift. I have no idea why the previous owner did all this and leave stock gears in it and put on 33" tires. I tried the "fill the tank, set the trip odo, drive, fill up and calculate milage." I know that I screwed up when I got 3mpg. I also know that the speed sensor is off, and is probably why my calculations got screwed.
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Old 01-18-2013, 09:22 AM   #20
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Quote:
Originally Posted by nuclearmuscle523 View Post
Firewall to grill bracing
This made me laugh.
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Old 01-18-2013, 09:23 AM   #21
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i look at the o.p.'s project a little differently than the prior replies...there's nothing wrong with tinkering w/ your jeep to improve some aspect of its performance, in this case it is fuel economy. good for you.

now that being said, i do agree you are sort of pee-ing up a rope trying to get any impressive fuel economy out of a TJ wrangler.

the o.p.'s 18 mpg highway economy is decent for a 4.0L TJ, but it is far from the best a lot of folks here are seeing on bone-stock, full-weight 4.0L TJ's. last summer on a 250 mile round trip in my 100% bone stock Sahara I saw almost 21 mpg on the out-and-back trip, done at 58-60 mph. and i did it with the sunvisors on!
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Old 01-18-2013, 09:57 AM   #22
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Heck yeah, I go everywhere with my sunvisors...
and my petrol card...
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Old 01-18-2013, 10:10 AM   #23
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Quote:
Originally Posted by JGreen06TJ View Post
Would be interesting to figure out how much money you've put into picking up 3 mpg and see how long it will take to recover that cost. Sounds like a lot of what you've done was required maintenance, but I wouldn't throw thousands of dollars into trying to save hundreds at the gas station.
X2

I get 18-19mpg when I keep it at 65mph and I'm lifted, 33s, 4.56 gears, armor, etc.
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Old 01-18-2013, 10:16 AM   #24
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driving smart is the best way to improve fuel economy.
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Old 01-18-2013, 10:29 AM   #25
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I'm tempted to go remove one of my grill supports and weigh it.

Well, not really..
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Old 01-18-2013, 10:31 AM   #26
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Is this a joke? Really? Yanking stuff out to increase MPG on what is probably the worse ratio of fuel efficiency to usable vehicle space on the road? My sisters Yukon gets better mileage than my TJ. But I didn't buy my TJ because it can go far and a gallon of gas, I bought it because it can go places that her Yukon could never dream of.

nuclearmuscle523.... do us all a favor and sell your Jeep to someone that wants a Jeep and go buy a Prius.
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Old 01-18-2013, 10:35 AM   #27
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The best thing I have ever done to improve my gas mileage on the Jeep is.....

Fill it up and drive it. Then fill it up again. Do not write down mileage or gallons used.

Do not set trip odometer after a fill up.

It's been working great. What I don't know can't stress me out.
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Old 01-18-2013, 10:55 AM   #28
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SSSSHHHH be vewy vewy quiet I'm hunting MPG
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Old 01-18-2013, 11:08 AM   #29
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Take off the top and fold down that clear wind deflector thingy that greatly inhibits better fuel economy.
ooh, and wear a helmet like this:
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Old 01-18-2013, 11:09 AM   #30
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So, I'm curious- What is the "secondary purpose" for removing the grill supports?
FWIW, you never mentioned tire pressure. Airing your tires up to the max pressure (on the tire sidewall) will probably gain you more (negligible, but more) M'sPG than everything else you've done.
I check my fuel mileage every once in a while, just for curiosity. My TJ gets substantially better mileage than my Silverado 6.0L so I'm good with my mileage for a daily driver. I don't know why everyone has issues with the mileage their TJ gets. They are what they are, and as far as I'm concerned, mid-high teens is pretty good for the overall design of the vehicle.

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