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How many miles per tank are you getting?

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Old 12-09-2010 | 10:32 AM
  #41  
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Originally Posted by Yamaha90
you guys must have cruise control and some other magic mod because i cant even break 200 sometimes. Something must be wrong internally
No cruise control. What I've noticed is that these things simply suck gas big time if you drive aggressively. They're not efficient on their own. If you want better mileage you must drive accordingly. I don't to jackrabbits, I rarely slam the gas pedal, I do a lot of coasting and I stay at 65 or lower on the freeway.
Old 12-09-2010 | 01:08 PM
  #42  
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I've gotten over 400 several times, the best was about 420. Usually I'm around 365-385 between fillups.

Mine is a bone stock X. 3.21 gears, stock 255-75r17 tires. I'm another who does a lot of coasting and light acceleration. It's my daily driver so I try to get as many mpgs as possible.
Old 12-09-2010 | 01:33 PM
  #43  
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Miles per tank is really a meaningless figure. A "tank" of gas can vary greatly in amount depending on how you fill the tank, how soon or how late your low fuel light comes on, etc.

The correct method would be to check your actual miles per gallon, and some folks really don't know how to do this correctly. I would not trust the vehicle computer to compute my MPG accurately.

There is really only one way to CORRECTLY check your gas mileage.

1. Fill up your tank and be sure to top it off. Click the fuel pump handle a few times to be sure your gas tank is completely topped off. Note: I'm told "topping off" your tank is illegal in some states.

2. Re-set your trip odometer to zero miles.

3. Drive

4. When you need gas, fill up again, and be sure to click the fuel pump handle a few times to be sure your tank is completely topped off. See note above.

5. Check your trip odometer and use this formula to check your gas mileage: (Miles driven divided by gallons used)

Example: 200 miles divided by 11.86 gallons = 16.86 miles per gallon

Your gas mileage on just one tank can vary substantially, because of wind. hills, traffic, temperature, city or highway driving, etc. I have even found that when using winter gas formulas (Ohio), I get worse miles per gallon then when using summer gas formulas.

Always best to check a few tanks of gas to get a good average miles per gallon figure.

Mabar
Old 12-09-2010 | 01:40 PM
  #44  
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Originally Posted by eldudeareno
Most of my driving is in town i have 4 door x with 33's and 13.6 mpg is the best i have gotten. Very disapointed with fuel economy on my jeep traded a v8 cadillac srx for it and the caddy actually got better gas milage.
You may be right, but good luck taking a cadillac through a creek or up a rock wall.
Old 12-10-2010 | 02:27 AM
  #45  
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Originally Posted by Tuto
Please be very careful running your tires at 50 PSI is very dangerous. That is not the recommended PSI for your stock tires. You can easily have Blow out doing 70 MPH.
Why is it dangerous? The MAX PSI cold for the stock tires is 50psi, as on the sidewall. Now, the recommendation from Jeep, on the door sill is (I don't remember), what 33psi? The tires are seperate from the vehicle, and the tires can be fitted to many different vehicles. Going BELOW the PSI on the door beam is a potentially serious problem, but above as long as the tire allows, is fine. Being below the tire pressure (door or tire) is likely to result in a blowout - see firestone/explorer etc - the reverse is not true - as far as I know or have found (show me!). The reverse only results in a slightly harsher ride. I believe that Fords argument mainly came down to that while Firestone recommended a higher PSI, Ford's lower PSI recommendation was unrelated to the excessive sidewall flex and eventual blowouts. Ha. I don't think there is a problem with the JK rating, but tire manufactures know tires, car manufacturerers know cars.

If we were still using bias plied tires, this could be an issue - but the stock tires are what, triple belted steel radials? The max PSI is the tires ability, and with radials, there isn't any stretching, that isn't any cupping. I beared that out on close to 40k miles of tires on the JK (and others). The tires are so stiff, and so strong, that they don't expand like a bike tire, if at all. Only slightly harsher ride results.

Now, if one were to hit a pothole at speed - this "could" present an issue where the tire would have been able to handle the blow, the higher pressure "blew it". But, if you hit a serious pothole at 75mph you are going to be having some serious problems no matter what. Even with that, the TIRE is rated to 50 psi cold on a heavier vehicle, where the impact would be even more severe.

Low tire pressures are much more likely to result in serious problems.
Old 12-10-2010 | 05:29 AM
  #46  
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I would say my average miles per tank is ~350. If I go on a road trip (thus doing all highway driving) I get between 425 and 450+ miles per tank before the light comes on depending greatly on weather (AC on or off, etc). If I do pure driving around town on a tank (doesn't happen very often but has happened once or twice) I get ~300 miles out of a tank that usually works out to just under 17 mpg. I have an essentially stock JKU with the 255/75R17 SR-As with 3.21 gearing.
Old 12-10-2010 | 05:52 AM
  #47  
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Originally Posted by Tuto View Post
Please be very careful running your tires at 50 PSI is very dangerous. That is not the recommended PSI for your stock tires. You can easily have Blow out doing 70 MPH.
Originally Posted by rickyj
Why is it dangerous? The MAX PSI cold for the stock tires is 50psi, as on the sidewall. Now, the recommendation from Jeep, on the door sill is (I don't remember), what 33psi? The tires are seperate from the vehicle, and the tires can be fitted to many different vehicles. Going BELOW the PSI on the door beam is a potentially serious problem, but above as long as the tire allows, is fine. Being below the tire pressure (door or tire) is likely to result in a blowout
Although you are correct in stating that inflating your tires to 50 lbs will not increase the chance of a blowout (since your tires are rated to 50 lbs max), I would not recommend this.

Running your stock tires at 50 lbs, when the door sticker recommends 33 lbs, is WAY over inflating your tires. This may result in increased gas mileage, but it will also negatively affect the handling of the vehicle.

Way over inflating your tires like this will result in a MUCH harsher ride, plus the tire patch contact area with the road will be smaller, which will give you less traction in tricky situations, like wet roads, sharp turns, emergency avoidance maneuvers, etc.

Inflating your tires a few pounds over the door sticker is usually not a problem, but 50 lbs in your case is a full 51.5 % over the door sticker pressure. WAY too much pressure.

You probably aren't gaining that much mileage increase either, compared to going just a few pounds over the door sticker pressure.

I would guess that the gas mileage difference between inflating your tires to 50 lbs, or 36 lbs would be less than a 1 mpg difference.

Just my opinion and just my guess.

Mabar
Old 12-12-2010 | 12:36 PM
  #48  
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i know how to calculate gas mileage

I wanted to see how far people were going between fill ups (aka, fuel light)

I know unlimited's have a larger gas tank than the two doors, and i read signatures to be sure there isn't a two door getting 400 miles per tank.

According to the pump, for me, a complete fill up after the fuel light comes on is between 14-15 gallons.

My last tank was a wopping 190 miles... Waiting on a superchip now. Even if the chip doesn't improve fuel efficiency, i would still enjoy a correct speedometer and better shift points.
Old 12-12-2010 | 04:05 PM
  #49  
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Originally Posted by Yamaha90
i know how to calculate gas mileage

I wanted to see how far people were going between fill ups (aka, fuel light)

I know unlimited's have a larger gas tank than the two doors, and i read signatures to be sure there isn't a two door getting 400 miles per tank.

According to the pump, for me, a complete fill up after the fuel light comes on is between 14-15 gallons.

My last tank was a wopping 190 miles... Waiting on a superchip now. Even if the chip doesn't improve fuel efficiency, i would still enjoy a correct speedometer and better shift points.
Wow. You're getting half the mileage I'm getting. Yes our tanks are slightly different, but not by much. A superchip will not make a huge difference for you. You simply need to change how you drive. A superchip will give you a 10% advantage, but 10% of what you're currently achieving is a number too low to notice. Slllooooooow down. Accelerate slowly. Pretend your gas pedal only goes down an inch.
Old 12-12-2010 | 04:14 PM
  #50  
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Over the past 4 tanks of fuel, my 2007 Unlimited (bone stock) is getting about 17.4 mpg.

I drive about 140 miles per day, mostly highway miles.
The computer says it is getting 20.3 mpg....but the math says otherwise.

3" Suspension lift is getting installed next week. I will be interested to see the difference.



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