Jeep Wrangler Forum

Jeep Wrangler Forum (http://www.wranglerforum.com/)
-   TJ General Discussion Forum (http://www.wranglerforum.com/f282/)
-   -   Major mileage decrease since 32" tire install (http://www.wranglerforum.com/f282/major-mileage-decrease-since-32-tire-install-85410.html)

viclava 03-19-2011 12:07 PM

Major mileage decrease since 32" tire install
 
Let me just start off by stating that I knew I was going to decrease my already crappy mileage, by installing 32" BFG Mud Terrain K2's, but I would typically get around 200-220 miles per tank of gas on my Wrangler(which BTW has the smaller fuel tank), but now I get maybe 160 give or take. My engine has not thrown any codes, but could it be that my o2 sensors should be replaced? I'm kind of at a loss here. I should state that most of my driving is around town driving.

98 Wrangler Sport

BLEGAN 03-19-2011 12:12 PM

im not sure what the norm is as far as how much mileage decreases, but it does seem a bit excessive. if youre not getting any codes for the o2 sensors, its probably not them.. but maybe check your cat? i think you'd get a sensor code for that though.. im not sure haha. ive got both codes for both o2 sensors right now but i havent lost any mileage, so im not fudging with them. do you notice any actual loss in power?

pokey 03-19-2011 12:13 PM

Your speedometer should be re-calibrated and m/t's on the road, well....

adkjoe 03-19-2011 12:18 PM

Your speedometer is off now and it's not giving you correct mileage. your going farther than your speedometer thinks. yea you lose gas milage with larger m/t tires for sure but it makes it look like even more until you replace the speedo gear.

http://www.4x4xplor.com/speedo.html

viclava 03-19-2011 12:21 PM

My Wrangler runs good with no indicated loss of power since the Rc2.5" lift and BFG MT K2's.

BLEGAN 03-19-2011 12:31 PM

Quote:

Originally Posted by adkjoe (Post 1125968)
Your speedometer is off now and it's not giving you correct mileage. your going farther than your speedometer thinks. yea you lose gas milage with larger m/t tires for sure but it makes it look like even more until you replace the speedo gear.

Changing Your Jeep Speedometer Gear

yeah... that makes sense :doh:

adkjoe 03-19-2011 12:35 PM

Quote:

Originally Posted by BLEGAN (Post 1125986)
yeah... that makes sense :doh:

How does that not make sense? With larger tires your traveling farther than your odometer thinks....

If you increase your tire size by 10% when your odometer says you have gone 100 miles you have actually gone 110...simple math.

BLEGAN 03-19-2011 12:43 PM

Quote:

Originally Posted by adkjoe (Post 1125993)
How does that not make sense? With larger tires your traveling farther than your odometer thinks....

If you increase your tire size by 10% when your odometer says you have gone 100 miles you have actually gone 110...simple math.

i just said it makes sense.... haha. i wasnt being sarcastic. and the doh was for myself.

adkjoe 03-19-2011 12:49 PM

Oh OK...I have always sucked at detecting sarcasm :)

BLEGAN 03-19-2011 12:57 PM

Quote:

Originally Posted by adkjoe (Post 1126010)
Oh OK...I have always sucked at detecting sarcasm :)

i try not to use sarcasm on the net. if i do, its obvious. like...




THAAATTTT makes sense...........

tlarm139 03-19-2011 09:58 PM

yeah i have a 2001 sport auto I6. put 33x12.50 wrangler mt/r's on it without regearing or anything and i actually havent noticed a huge drop in mpg yet. hopefully it stays that way

Stagman 03-20-2011 07:07 AM

I always check the speedo with one of my GPS units then I know my true speed and odometer factor. FYI I have yet to ever encounter a speedometer or odometer that is correct from the factory. Always shows faster and farther than it really is.

SurfKaster 03-20-2011 08:34 AM

Quote:

Originally Posted by BLEGAN (Post 1126028)
i try not to use sarcasm on the net. if i do, its obvious. like...




THAAATTTT makes sense...........

All the more reason for the much needed sarcasm font.


All times are GMT -5. The time now is 11:06 PM.