Dramatic MPG Drop
Thread Starter
JK Newbie
Joined: Dec 2011
Posts: 92
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From: Charleston, WV
Dramatic MPG Drop
I switched out my stock 255/75/17's for a set of Maxxis Bighorn 285/70/17's. Since doing this about two weeks ago I have seen a nearly 2 1/2 mpg loss. That's a huge loss for such a little change, and I definitely didn't expect a drop like that. Any else experiencing the same thing?
JK Newbie
Joined: Jun 2011
Posts: 90
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From: Washington State
when I went to a bigger tire... From the stock 225/75/16 to my 265/70/17's my speedo and odometer are both now off by 10%.
So speedo says 55mph but gps says im doing 60. Odometer says .9 miles travelled, but i really travel 1.0.
So when manually calculating fuel economy and accounting for my wrong odometer reading, my drop in economy wasnt much at all compared to what the jeeps calculator would have me believe.
So speedo says 55mph but gps says im doing 60. Odometer says .9 miles travelled, but i really travel 1.0.
So when manually calculating fuel economy and accounting for my wrong odometer reading, my drop in economy wasnt much at all compared to what the jeeps calculator would have me believe.
Thread Starter
JK Newbie
Joined: Dec 2011
Posts: 92
Likes: 0
From: Charleston, WV
Originally Posted by Atch
Get an aev procal, you'll get some of your lost mpgs back
JK Enthusiast
Joined: Sep 2010
Posts: 124
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From: Nampa ID
Originally Posted by jeepmojo
IF YOUR ONLY LOOSING 2MPG DONT COMPLAIN IF YOU HAND CALCULATE YOU MAY JUST FIND IT EVEN WORSE !
ITS ALMOST ENOUGH TO MAKE YOU WANT YOUR STOCKERS BACK ON BUT NOT QUITE!
MY MOTO IS ALWAYS THIS !
( ITS NOT CHEAP TO LOOK THIS GOOD !)
ITS ALMOST ENOUGH TO MAKE YOU WANT YOUR STOCKERS BACK ON BUT NOT QUITE!
MY MOTO IS ALWAYS THIS !
( ITS NOT CHEAP TO LOOK THIS GOOD !)
Thread Starter
JK Newbie
Joined: Dec 2011
Posts: 92
Likes: 0
From: Charleston, WV
Originally Posted by jeepmojo
IF YOUR ONLY LOOSING 2MPG DONT COMPLAIN IF YOU HAND CALCULATE YOU MAY JUST FIND IT EVEN WORSE !
ITS ALMOST ENOUGH TO MAKE YOU WANT YOUR STOCKERS BACK ON BUT NOT QUITE!
MY MOTO IS ALWAYS THIS !
( ITS NOT CHEAP TO LOOK THIS GOOD !)
ITS ALMOST ENOUGH TO MAKE YOU WANT YOUR STOCKERS BACK ON BUT NOT QUITE!
MY MOTO IS ALWAYS THIS !
( ITS NOT CHEAP TO LOOK THIS GOOD !)
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JK Freak
Joined: Jun 2011
Posts: 693
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From: Clearwater, Florida
Shit I went from 18 mpg with 32" stockers to 10 mpg with 35" KM2's. I regeared and got an AEV Procal an back to 14.5 mpg's city. Get used to losing mpg's with every armor mod and upsize in tires.
JK Enthusiast
Joined: Jan 2012
Posts: 399
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From: Paducah, KY
I switched out my stock 255/75/17's for a set of Maxxis Bighorn 285/70/17's. Since doing this about two weeks ago I have seen a nearly 2 1/2 mpg loss. That's a huge loss for such a little change, and I definitely didn't expect a drop like that. Any else experiencing the same thing?
B-Like said before, are you calculating the difference in indicated speed to actual speed into that mpg? (The computer does NOT do this without being reprogrammed.)
C-When you say trail and mpg you shouldn't be including trail time. Slow speed work and fast wheel spinning will just suck fuel. You'll get horrible mpg no matter what.
D-Are you figuring this out by hand (miles driven / amount of fuel used = mpg) or the stock computer?
Thread Starter
JK Newbie
Joined: Dec 2011
Posts: 92
Likes: 0
From: Charleston, WV
Originally Posted by AJMBLAZER
A-Larger, heavier tires = engine has to work harder to turn the tires.
B-Like said before, are you calculating the difference in indicated speed to actual speed into that mpg? (The computer does NOT do this without being reprogrammed.)
C-When you say trail and mpg you shouldn't be including trail time. Slow speed work and fast wheel spinning will just suck fuel. You'll get horrible mpg no matter what.
D-Are you figuring this out by hand (miles driven / amount of fuel used = mpg) or the stock computer?