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Unread 05-06-2005, 10:16 AM   #76
SirGCal
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Quote:
Originally Posted by fergyfer
If I travel 250 miles according to my odometer, I have actually traveled 257.5 miles.
Which is why I use my GPS for a true reading. At 200 miles (all I can get out of a tank, never dream of getting 250+) my odometer will be off by about 9 miles (tested in nearly strait line driving across Texas). And that's just with 31" tires.

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Unread 05-06-2005, 10:21 AM   #77
rhinoss
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Quote:
Originally Posted by Jim Shanks
If I don't drive with a heavy foot I can get around 18. ... It's all in how you drive I think. ...
I've tested this on two seperate instances and that's exactly how I feel. If I insure that I drive a little easier on the pedal, I can get around 18 on the highway.. If I don't... it's 12 to 13 mpg
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Unread 05-06-2005, 10:24 AM   #78
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A gps will get you pretty close, but it would have to be perfectly flat and straight driving (something you could do in West Texas for sure!) to be exact. It will tell you exactly how fast you are traveling and comparing that to your speedometer will give you a pretty good idea of how to compensate for the difference.
Driving into a stiff wind surely takes it toll on mileage with a jeep. I hate driving into a stiff wind.
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Unread 05-06-2005, 10:57 AM   #79
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Mpg

Gas prices are why I am keeping my 3.73 gears. I do not do the rock thing we mostly mud where I live. I drive 22 miles to work, on a 2 lane road, at 2,000 rpms that is 57mph, I have a 29 tooth speedo gear, with 35" tires, speedo is off one tenth on a ten mile odometer check. I can go 220 to 225 miles on 15 gallons, do the math, about 15 miles to the gallon. I have drove 65 to 70, and go 180 miles on the same 15 gallons, speed makes a big differance.
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Unread 05-06-2005, 11:45 AM   #80
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'05 Rubicon with the 4.11's. Only have 350 miles on it so far. It better get better.
I have the K&N FIPK and A Magnaflow Cat-Back on.
Nice little pick up in acceleration BUT not worth the Camaro sound (already have one of those).
If anybody wants to by a Magnaflow Cat- back (less than 100 miles on it)
Gas mileage is 15.6 (mostly highway, cruise control at 62-65).
Do these things get appreciably better when they break in ????
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Unread 05-06-2005, 01:10 PM   #81
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I get 17.5 to 18.5mpg. That's an '03 sport with the 4.0L, 3.07 gears, and stock 225/75/R15 tires. Roughly 70% of that is on the highway at 70-75mph.

And to answer RubiconSS, no, my mileage didn't improve any after break-in. I've been getting 18 mpg since the day I brought it home. I was hoping it'd improve to 20, but it never happened.
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Unread 05-06-2005, 02:08 PM   #82
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Quote:
Originally Posted by igofshn
I'm going to throw up the B. S. flag on getting close to 20. 15-16 is close to 20 but you aren't going to get any better than that. better get a new calculator.

Word.
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Unread 05-06-2005, 02:27 PM   #83
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Quote:
Originally Posted by igofshn
I'm going to throw up the B. S. flag on getting close to 20. 15-16 is close to 20 but you aren't going to get any better than that. better get a new calculator.
I get 19 highway and 14.5-15 in the city. 4.0L Automatic.
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Unread 05-06-2005, 02:30 PM   #84
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Quote:
Originally Posted by AZTJ2001
I ended up at 17.8 mpg, and that included correcting for 31" BFG A/T's instead of the stock 30's. I can't drive any slower, how the hell can I ever get over 20mpg? BTW, everything's stock except the tires.
BFG 31's are not just bigger. They are a LOT heavier than the stock tires. BTW, maximum mileage doesn't come from 30" tires. It comes from the P225/75R15's - which are, as you know, completely unacceptable.
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Unread 05-06-2005, 03:33 PM   #85
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Bs Flag

Will the BS flag get me any better gas milage?
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Unread 05-06-2005, 03:50 PM   #86
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I don't know about 20 mpg being BS. My '04 Wrangler X with 3.07 gears and 5sp manual and P215x75R15 tires got 20.1 mpg on the highway a few times after the initial 1000 mile break in. That's when I used to travel 45 miles each way to work everyday going about 50-60 mph on average.

Now that I've gone from 27.5 inch tires (P215) to 30.5 inch tires (31's) with heavier steel rims I might see 16 on the highway and about 14 in the city but my new job's only 3 miles away from home.
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Unread 05-18-2005, 10:25 AM   #87
marcopolo
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Mpg

Being an aussie i had to convert km/L to mpg:

2004 TJ, 3.07 gearing, 5 speed, 235/75R15

18 mpg - city driving
20 mpg - highway
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Unread 05-18-2005, 11:32 AM   #88
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Quote:
Originally Posted by igofshn
I'm going to throw up the B. S. flag on getting close to 20. 15-16 is close to 20 but you aren't going to get any better than that. better get a new calculator.
Dont throw that flag up too fast ... I know someone that is getting better than 20mph but 90% of her driving is highway. It's not a fluk either as this is her second 4.0 to get it. So it is very possible.

Now me around town. 16 is about the norm.

David
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Unread 05-18-2005, 11:48 AM   #89
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In a couple of weekends, I'll be taking about a 1300 mile road trip in the 99 tj. I'll be keeping my mileage on that trip and I'll post it. I haven't ever checked it on a trip, just here around the rural country. I'm curious, since I used to get 20-21 in my yj.
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Unread 05-18-2005, 12:41 PM   #90
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Interesting that you should ask. I've got a 97 Sahara (4.0) and just calculated it the last several fill-ups for some unexplainable reason. It came out 17.1 and 17.2 mpg.

I've got a 4" Teraflex lift with Rubicon Express long arms, 1 3/4 in. coil spacers, 2 in. body lift, 4.56 gears, 35x12.5/15 BFG ATs 10x15 rims. ARBs front and rear. I've got all kinds of skid plates weighting me down, a Warn 9500 winch, Sun Performance rocker guards and Bulletproof bumpers front and rear with a tire carrier from the same company. All this weighty stuff is why I've got the coil spacers and body lift.
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