J30 Gas Mileage?

[atowersmusic]

320

[atowersmusic]

yea i agree

[brandonjustice93J30]

just be thankful at least everyone is getting 19+ ....right now while I was getting work done on my J, I have my Mom's Jeep for a few weeks.

It gets 16 on a good day, 12-14 if I'm in 4x4 or have a heavy foot.

[gr8scott72]

just be thankful at least everyone is getting 19+ ....right now while I was getting work done on my J, I have my Mom's Jeep for a few weeks.

It gets 16 on a good day, 12-14 if I'm in 4x4 or have a heavy foot.

Yeah, 19 is good compaired to my other 2 vehicles. I get 13 out of my 5.9L Durango and about 10-11 out of my 93 F-250 with the 7.5L V8 gas burner.

[yodawill2000]

nothing like watching the needle drop when you go WOT huh hehe

[gr8scott72]

nothing like watching the needle drop when you go WOT huh hehe

In that truck, I just DON'T go wot. lol

[mad1sdaddy]

I was getting about 350 this summer, but something is not working properly and I am getting about 250 now. I havent run the code check but if I had to guess it is probably my o2 sensor causing me to run rich. I can smell the gas pretty bad on first start up of the day. Either that or I have a fuel leak somewhere.

[brandonjustice93J30]

I hear you on the Durango...I had a 1997 Dakota 4x4 Ext Cab with the 5.2 that I had changed the intake, exhaust, and computer. I was lucky to get 10-12 the way I drove it. I was spending about $60 a week when gas was $0.89/gal.

I miss those days of cheap gas...lol

[naladude911]

15-18

[Jakw]

350.4 miles divided by 13.787 gallons to fill up this time.A little over 25...

[Bhong]

I avg. about 20. but with a 19 gallon tank, It will last a bit.

'93 J30'03 Honda CRV

[driverdriver]

I don't know about anyone else, but I've noticed that I get the best fuel economy on my J (and also on the Saab and Acura) in the spring and fall when the temperature is fairly constant. Extreme heat/humidty and cold/wind chill mess up my fuel economy. I'm sure it has to do with the air-fuel mix.

[rclem7]

I have noticed the same thing. I think its partially because we ain't running our AC's and because that's the optimal air temp for the way the cars are setup/tuned. I just got my J and with the first full tank I put in it, I was able to get 24.5. Today I filled up (third full tank) and I was able to get 26. Im happy with that since it's close to what my last car got.

I do have one question, does anyone else have a fuel gauge that reads empty with 4-5 gallons left in the tank? I drove it till the light come on today, had been on empty since leaving work yesterday (35 miles one way) and when I filled up tonight it only took 15.3 gallons. I figured it would be around 17 gallons to fill up, but no.

[ososlow]

about 260-270 also

[gr8scott72]

about 260-270 also

Now divide that number by the number of gallons it takes to fill it back to full and you have a meaningful number, MPG.

[rclem7]

about 260-270 also

Ya'll must drive in the city? I can't stand heavy city traffic! Traffic lights and idiot drivers give me road rage. If I could get away with it, I would shoot out all the traffic lights!! not really. The horrible gas mileage, how do you guys stand it? But I guess if you only drive a few miles everyday and fill up once a month it's not so bad. I do have to fill up once a week.

[gr8scott72]

Ya'll must drive in the city? I can't stand heavy city traffic! Traffic lights and idiot drivers give me road rage. If I could get away with it, I would shoot out all the traffic lights!! not really. The horrible gas mileage, how do you guys stand it? But I guess if you only drive a few miles everyday and fill up once a month it's not so bad. I do have to fill up once a week.

How do you know at what point he fills his tank? He lists a mile distance but doesn't say how much gas it took to get to that point. He could just be stopping before it's actually empty.

Oh, if you want to see road rage, rent the steven speilburg movie "Duel". That's road rage to the extreme.

[elan]

you cannot beat my Dad's old Russian military 6x6 truck ZIL-131 which had a 150HP V8 engine. It averaged approx 5 mpg at best times , you had to carry a couple of 50gallon barrels with you if you wanted to go somewhere deep in the woods

here is a pic http://www.121mv.com/russian_v...7.jpg

We used it once in a while when we had to go for a fire wood or bring some soil for our backyard. That's the burner

[elan]

I get empty at approx 16.5g

[fogged306]

A thing occured to me a little while ago, these cars have clutch fans. If we swapped them out for electric, MPG would increase for the simple fact that eliminating the parasitic loss of the fan will free up some hp. I have built a few street cars in my day, and on every one of them, I have removed the clutch fan set-up and replaced them with an electric puller. I currently am building a mustang and have seen guys gain up to 18 rwhp from installing an electric fan alone on those cars. On this car we probably won't see quite that much, but enough to make it worth it, that will be my next project for this car. I have a Black Magic fan for my mustang thats still in the box and since that car isn't going to be done for a while, I'm going to put it in the J30. I'll post my gains if anyone is interested.

Edit: Now that I think of this, I wouldn't jump right on this one just yet. I remember reading that these fans draw 130A on start up and then around 40A constant while running, this may be a bit much for the charging system in the J30. I'm still going to try, but this may be the final nail in my alternators coffin.

Modified by fogged306 at 7:35 PM 3/7/2008
Modified by fogged306 at 7:36 PM 3/7/2008

[gr8scott72]

A thing occured to me a little while ago, these cars have clutch fans. If we swapped them out for electric, MPG would increase for the simple fact that eliminating the parasitic loss of the fan will free up some hp. I have built a few street cars in my day, and on every one of them, I have removed the clutch fan set-up and replaced them with an electric puller. I currently am building a mustang and have seen guys gain up to 18 rwhp from installing an electric fan alone on those cars. On this car we probably won't see quite that much, but enough to make it worth it, that will be my next project for this car. I have a Black Magic fan for my mustang thats still in the box and since that car isn't going to be done for a while, I'm going to put it in the J30. I'll post my gains if anyone is interested.

Edit: Now that I think of this, I wouldn't jump right on this one just yet. I remember reading that these fans draw 130A on start up and then around 40A constant while running, this may be a bit much for the charging system in the J30. I'm still going to try, but this may be the final nail in my alternators coffin.

If you do it, look into some of the old ford fans, like off an old Taurus and the Lincoln Mark 8 iirc. They are some of the strongest stock fans and you can find them cheap.

Modified by gr8scott72 at 4:32 PM 3/10/2008
Modified by gr8scott72 at 4:51 PM 3/10/2008

[Defiant]

I get 20 miles per gallon almost all the time, up around 22 if it's a long enough highway tank with enough traffic to get in the way. I tend to drive like Winston Wolf. Try to keep up.Being on the road in a J30 is extremely pleasant, but any road time is lost time. So I try to get it over with in as few minutes as can be done.

[Leuthesius]

When I bought mine about two weeks ago, I was getting 29.1mpg when I left Garland TX, I'm now averaging about 18-20mpg in city. The 29.1 was running at about 65mph though...

Fuel econ has been steadily getting worse, but the power of this car is addicting. VRROOOOOOOM.

I seriously had a dream last night where I was Nascar-ing the car to and from the grocery store repetitively. How messed up is that? <3 J30!

[kbflip02]

thats one thing about city driving...here in houston i get around 17-18 mpg....havent taken any highway trips lately though...just recently redid the entire exhaust so i need to find out what it is

[NegusJT]

sooo, i see everyone else is gettin good gas mileage except me

i am still getting roughly 13-15mpg city.

thus far i have put on much needed new tires, cleaned the MAF and air filter. what else can i do?

O2 sensor? spark plugs? what??

[yodawill2000]

Spark plugs made a noticeable difference on my J.

Also a can of BG44k might surprise ya.

[brandonjustice93J30]

I'm getting ready to do both here in April (plugs and bg44) ...get my bonus from work and finish my repairs and maintenance items

[NegusJT]

thankz,

will be ordering some off ebay soon and a set of ngk g-power platinums from rockauto. will do an oil change with that too.......by the way any tips on the oil change or is it pretty much straight forward.

also when took one of the spark plugs out to see what it looked like, it was kinda "ashy" or whitish.......just wondering if this was normal wearing since someone told me that the "ash" might be a sign of the J running kinda rich.

thankz.

[yodawill2000]

Oil change is strait forward.But you should consider getting the OEM spec plugs PFR5G-11

Other plugs have been known to cause issues.Theres a reason one plug cost 3 bux and the real deal is more like 11.50 a pop.Sparkplugs.com has some good pricing and if you call and tell them your from the Nico forums you should get a discount. !!

[NegusJT]

thankz yoda,

u were right, i was about to order the wrong ones. for some reason i thought the G-powers were going to be just as good as the laser plats but looking at the price....why would think that. lol

and thankz for reminding me about sparkplugs.com, that is where i got my set for my cressida

what about the O2 sensor? if i replace that, u think that would help aswell?