Weird MPG experience

Spent the weekend driving to and from Santa Rosa Beach, FL (awesome, btw) and had a strange MPG experience.

On the way up I got between 17.5-19.0 MPG on all my fill-ups. On the way back, I dropped down to 14.5-15.5 . On my last fill up before SA I got back up to 16.5-17.0, and then once back in SA I'm at 18.5-20.0 in the city.

Seems odd... no change in driving habits along the way. On the highway, I had it at 70 on cruise control the whole way. Any thoughts? Could it all be a matter of headwind?

wind

Yeah wind will kill you MPGs right away

ditto on wind

Wind, and maybe you had to drive up hill more often to TX than on your way to FL?

Well... I guess I'll chalk it up to wind then... seemed like a pretty huge drop, and had me worried something was wrong with my engine at the time.

Its the wind.

Sunday coming home from Bolivar, I was going into the wind, 15.5mpg.

Made the turn onto I-10, wind at my butt, got almost 21.

Its been said before, but the JK is a big brick with wheels..... ........and slides thru the air like one.

Yeah maybe a parasail might not be a bad idea for a mod. Just launch it in a tail wind and compensate for those killer headwinds!

I am new to this site thanks to my buddy Ron G. I have 2008 unlimited with a 4" pro comp and 35" tires and getting only 200 miles to a tank of gas is this normal??

Freetail_Rubicon wrote:

Seems odd... no change in driving habits along the way. On the highway, I had it at 70 on cruise control the whole way. Any thoughts? Could it all be a matter of headwind?

Could also be fuel additives...I know that on the East coast, during the winter months they use (I think) an oxygenated fuel mixture...MPG sucks in general with it (I recall this from being in NY).

Maybe you filled up at a station with the "winter blend"?? Just a thought.

I'm only getting 180 miles per tank so it sounds like your doing better then me!

since i have not recalibrated, i have not checked what my fuel economy is.

that will change in about 20 min... i am going to use my procal today!!

Wow, that is low. I'm getting 220-240 a tank going by the odometer, and that's with 37's and no speedo correction.....

MARK B wrote:

I am new to this site thanks to my buddy Ron G. I have 2008 unlimited with a 4" pro comp and 35" tires and getting only 200 miles to a tank of gas is this normal??

I don't have 35's ....yet, but your figure sounds about right.

TxCrawler wrote:

Wow, that is low. I'm getting 220-240 a tank going by the odometer, and that's with 37's and no speedo correction.....

Your's must be an anomally, cuz I'm getting about 260-270 with 32's!!

yep...32s get you real close to 300 on a good tank for me too...only down from there for 35s.

TxCrawler wrote:

Wow, that is low. I'm getting 220-240 a tank going by the odometer, and that's with 37's and no speedo correction.....

yes but you have a bigger tank then I do the 2drs have 18 gal tanks I think and the 4ds have a 22 gal tank I think

G is getting around 250 -260 miles per tank

MARK B wrote:

I am new to this site thanks to my buddy Ron G. I have 2008 unlimited with a 4" pro comp and 35" tires and getting only 200 miles to a tank of gas is this normal??

My speedo is jacked - about 10mph off at 55. I have no clue how many miles to the gallon/tank that I am getting. I was going to say that I was getting 300 miles on a tank and that your rig is a POS.....

If you can just figure out how to run that thing on ethylene...

My tank probably holds at least 2 gallons less than it is supposed to, but my Jeep gets about 240-250 miles per tank with its 37's. Stock it was good for a little over 300 miles per tank.

Duke wrote:

My tank probably holds at least 2 gallons less than it is supposed to, but my Jeep gets about 240-250 miles per tank with its 37's. Stock it was good for a little over 300 miles per tank.

I suppose you can thank K-rocks for the drop in capacity

Duke wrote:

My tank probably holds at least 2 gallons less than it is supposed to, but my Jeep gets about 240-250 miles per tank with its 37's. Stock it was good for a little over 300 miles per tank.

no shit!!!!!!!!!! mine held almost 23 gallons a year ago.....now the most i can cram in it is 19

CRUX wrote:

Duke wrote:

My tank probably holds at least 2 gallons less than it is supposed to, but my Jeep gets about 240-250 miles per tank with its 37's. Stock it was good for a little over 300 miles per tank.

I suppose you can thank K-rocks for the drop in capacity

Going again on the 21st and 22nd. If I wasn't trailering the JK ,I'd be worried about smashing the enought that it ight not have the range to get home!