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Old 01-12-2008, 07:26 PM   #1
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increasing mpg

Have you guys actually had any aftermarket products increase miles per gallon (air intake, TB spacer, etc)? Every product I look at claims to increase MPG, but i figure i'd ask the people who use them. Thanks

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Old 01-12-2008, 07:38 PM   #2
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not really the only things I have felt from any of my upgrades (TB,TBS, Air intake, Headers back exhaust) is a mild difference in the throttle response and power. not really in the MPG department

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Old 01-12-2008, 08:23 PM   #3
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thats weird fox, i go the same junk.. bored out throttle body, 3" air intake, catback.. last winter stock i got 180-190 a tank before the gas light turned on, this year after the mods i'm getting 230-240 before the light turns on.

Soon i will be getting a new front bumper to try my "aero dynamic" idea..
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Old 01-12-2008, 08:26 PM   #4
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25% more miles with that mods? i can´t believe that.
did you correct your speedo after putting on bigger tires?

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Old 01-12-2008, 08:27 PM   #5
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Quote:
Originally Posted by nicolas-eric View Post
did you correct your speedo after putting on bigger tires?
Nope, did not do anything with the tires nor the speedo gear, i got the same tires as last year still the same 30s just 6" of lift now
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Old 01-12-2008, 08:33 PM   #6
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trip is trippin.. I cant believe it either.. anyone used seafoam or any gas cleaner with good resaults.. I even tried inflaiting my tires to 40psi stil nothing, but a stiff ride. I get 190-200 before the light turns on.. calculated to about 12-13-14.5 max. never 15..

I calculate it from my trip miles and divide it to how many gallons I pump to a full tank (for the slow peeps).
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Old 01-12-2008, 08:41 PM   #7
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with my 35s and 4.56 gears and 6.5" lift 14.5 mpg is maximum....with 50 mph (legal max. speed for trucks on our highways) and cruise-control.
in all other situations its 11-14 mpg.

my old stock TJ with manual tranny and 30" tires had a mileage of max. 16.5 mpg at 50 mph.
after installing a throttle body spacer and a KN air intakle nothing changed.
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Old 01-12-2008, 08:59 PM   #8
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nico did the TB Spacer do anything as far as power goes?
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Old 01-12-2008, 09:04 PM   #9
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after installing the TB spacer i had the feeling that there was a bit more torque at 2000-3000 rpm. but i only had the feeling. after driving a friends stock TJ i saw that i was wrong.
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Old 01-12-2008, 09:11 PM   #10
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after installing the TB spacer i had the feeling that there was a bit more torque at 2000-3000 rpm. but i only had the feeling. after driving a friends stock TJ i saw that i was wrong.
i see you use the butt dyno also

i have a k&n filter.. also did nothing.. IMO i would think an electric fan will get maxx mpg. I dont want to get one due to no use for it besides getting mpg.

i still dream of a solid 20 mpg tj.
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Old 01-12-2008, 09:14 PM   #11
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btw Nicolas i thought cruise control would help mpg.. you got strict laws where your from.. i thought CA was tough
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Old 01-12-2008, 09:17 PM   #12
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my 2nd car (mercedes a170) has a mileage of 33 mpg at 65 mph. i wish my TJ had this mileage.
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Old 01-12-2008, 09:21 PM   #13
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as soon as i get the money i will buy one of those sharp bumpers to try my aerodynamic idea, i think that will make a difference
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Old 01-12-2008, 09:25 PM   #14
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cold air intake,throttle body spacer & i got nothin but a cool? noise - must be somethin in the water...gas in chicago?
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Old 01-12-2008, 09:49 PM   #15
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no idea man, i fill up from the same gas station i allways fill up in. Nothing. Let see what happens now since i edited my intake so its just like the ones from the store.
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Old 01-12-2008, 11:35 PM   #16
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We just bought a 97ZJ Laredo last month, 4.0, auto, 242, 3:55 gears, it was getting 8-10mpg, noticed in the colder weather it was not heating up right, replaced the thermostat with a stock one, the old one came out in 3 pieces, went up to 19 around town and 22-24 on the hiway. Also pumped up the tires to 35psi. Will be doing a tune up on it once it warms up a bit more. But the low temp never let the engine come out of cold loop, when I put the chrysler scanner on it and looked that error was repeated multiple times. If you put a lower temp tstat in there to help it run coolerl, don't, change it back. I also just ran a couple of bottles of Chevron Techron fuel system cleaner thru, 20oz bottles and it's running smoother now. Changed all the fluids to mobil-1, engine, TC and diffs, leaving the tranny alone for now.
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Old 01-13-2008, 01:05 AM   #17
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My CAI and Flowmaster both boosted my mpg by like 1 mpg each. The chip i got fell off I think, so it don't do anything.

My cousin's GMC went up 10 mpg on the freeway by adding a resistor to his o2 sensor! He now gets 46 mpg average for 2 hours of driving to my house.
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Old 01-13-2008, 01:13 AM   #18
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Quote:
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My CAI and Flowmaster both boosted my mpg by like 1 mpg each. The chip i got fell off I think, so it don't do anything.

My cousin's GMC went up 10 mpg on the freeway by adding a resistor to his o2 sensor! He now gets 46 mpg average for 2 hours of driving to my house.
He leaned it out alot, gotta wonder what that is doing to the valves, bet a valve job is in his future. Have him pull the plugs and check them. I'd be surprised if there were any electrodes left..
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Old 01-13-2008, 01:17 AM   #19
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im running a true flow filter with stock tube and box, flex a lite e fan, flowmaster exhaust, 33s, 3.73s, corrected speedo gear and i average 14 to 16mpg a tank.
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Old 01-13-2008, 01:18 AM   #20
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I don't know, it runs nice. He gained like 30hp too
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Old 01-13-2008, 01:23 AM   #21
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Toby i think someone is pulling your chain, messing with the o2s with a resistor will do nothing but set off an engine light and put his truck into dummy mode. going from 10mpg to 46mpg is a far stretch. what kind of gmc is he running, truck car???
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Old 01-13-2008, 01:34 AM   #22
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He was getting 30-36 on the highway before any mods. I drove his truck, it was still at an average of 42 mpg average for 73 miles when he got to my house. It was on his dash computer readout strip.
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Old 01-13-2008, 01:34 AM   #23
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Its a 2500 v8
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Old 01-13-2008, 01:44 AM   #24
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a 3/4 ton v8 gasser getting upwards of 46mpgs.... dude come on.... im not gonna argue, if hes getting that then thats awsome.

my 1/2 ton gasser sometimes hits close to 20mpg if im lucky with a tail wind behind me.
tell him to reset his odometer, next time he fills up. then at his next fill up, divide the miles by gallons added.
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Old 01-13-2008, 01:56 AM   #25
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He used 2 gallons of gas goin 72.5 miles today. Half freeway, half driving in Chico.
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Old 01-13-2008, 02:27 AM   #26
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here's my gas saving device

I just don't drive it every day It's the wife's car
(this is not the actual car the wife just owns one)
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Old 01-13-2008, 02:42 AM   #27
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dode you know what the cheap 5 bucks resistor mod does? It makes the engine think the air getting in is "colder" so the engine adds more fuel. I gotta say thats impossible to gain 10-15 mpg with a resistor that puts in more fuel.
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Old 01-13-2008, 03:18 AM   #28
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Maybe his o2 sensor was off, and the resistor added the right amount.... I really don't know, I just saw the numbers, and they don't lie
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Old 01-13-2008, 04:05 AM   #29
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man all this time gmc should compete with 4 cylinder hybrids that only get 35mpg on freeways..

toby you are gullible, no offense.
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Old 01-13-2008, 04:40 AM   #30
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I drove the freakin thing. his odo was a 73.5 miles for the trip, and the fuel used was at 2.1g. The whole trip was at optimum rpm, but still. I drove it at 55 down vinyard for 10 min, and it read between 42 and 30 the whole way, except take off. I peeled out.

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