Fuel efficency

[J_0ne]

So I had my JTR for a few months now but have not pur too many miles on it. One thing I notice is I cant get more than 13 miles a galon, is this normal?
This was on a trip of about 30 miles 15 city no trafic just lights, and 15 highway.

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[whiteglad]

I get 19-21 highway uphill and on the level at 70-80 mph. Are you running huge tires, big lift, etc?

 

[Empty Pockets]

I’ve not had that issue. This was a road trip, lots of windy 2 and 4 lane hwys. Mostly 60 to 70 mph. Around town, to and from work, running errands I get 21 to 22 pretty steady. 6 speed manual and a light foot.

 

[J_0ne]

My truck is completly stock Auto trans, no tires or lift.
I figure if there was something wrong with the engine I would get a code but noy getting any codes either.

 

[Empty Pockets]

Yeah, that’s not right. Have you tried running a full tank through, filling up and dividing it out the old fashion way to verify your mileage? Could be the computer Is not giving you the right number. Divide miles driven by gallons consumed.

 

[Phljeeper]

Definitely something is not right. I am on 37s and the last tank was mostly city driving and I got 15. Picture was right after a fill up this afternoon. I reset my average mpg right after filling up last tank to track how I did after moving from 35s to 37s. And I am not gentle with the throttle.

 

[Buzzlb]

I’ve been getting ~20+ HW, 16 in Town on 35’s.

 

[jbn40301]

Are you driving in 4 High? This is the milage I get in the winter in 4 high full time maybe the transfer case has not disengaged your 4 high... I get 17.2 in 2 WD with 33" tires in town 21-22 Hwy

 

[J_0ne]

I am going to have to call the dealer and see if they can scan to see what is going on. As you can see no additions to the truck and at least the display shows 2H, so unless there is an underline mechanical issue that is not displaying a code on the dashboard I have no idea why I am getting such low milage.

 

[ShadowsPapa]

So I had my JTR for a few months now but have not pur too many miles on it. One thing I notice is I cant get more than 13 miles a galon, is this normal?
This was on a trip of about 30 miles 15 city no trafic just lights, and 15 highway.

What was your speed on the highway? Any vehicle will drop economy like a rock over 60 or so, and Jeeps are like shoving a brick through the wind. Wind resistance increases exponentially over about 60............ so if you were pushing 75-80 expect the MPG to suck.

Mine is Overland with the higher gears that Rubicon, but still...........

 

[J_0ne]

What was your speed on the highway? Any vehicle will drop economy like a rock over 60 or so, and Jeeps are like shoving a brick through the wind. Wind resistance increases exponentially over about 60............ so if you were pushing 75-80 expect the MPG to suck.

Mine is Overland with the higher gears that Rubicon, but still...........

I was doing 60 to 65, but comparing to what other are getting its way off. I just dont get why I am not getting a code or a check engine light if there is somthing that way off.

 

[ShadowsPapa]

I was doing 60 to 65, but comparing to what other are getting its way off. I just dont get why I am not getting a code or a check engine light if there is somthing that way off.

You should be doing a lot better at those speeds. Yeah, something is amiss.

 

[ShadowsPapa]

Are you driving in 4 High? This is the milage I get in the winter in 4 high full time maybe the transfer case has not disengaged your 4 high... I get 17.2 in 2 WD with 33" tires in town 21-22 Hwy

Wow, I'd expect he'd really know it driving on dry pavement in 4H. When I ended up on dry pavement with my F250 that thing would bind and jump and be crazy on tight turns and would tell me in no uncertain terms it didn't like it.
This should be the exact same way because, well, it's the same setup - front and rear drive shafts are together in 4H, there's no differential between them. It should shudder on turns and trying to park.

 

[jbn40301]

Wow, I'd expect he'd really know it driving on dry pavement in 4H. When I ended up on dry pavement with my F250 that thing would bind and jump and be crazy on tight turns and would tell me in no uncertain terms it didn't like it.
This should be the exact same way because, well, it's the same setup - front and rear drive shafts are together in 4H, there's no differential between them. It should shudder on turns and trying to park.

I would agree 110% but you never know unless you ask....So my Mom told me....

 

[ShadowsPapa]

I would agree 110% but you never know unless you ask....So my Mom told me....

She must be pretty smart........... (and got that way by asking questions, perhaps?)

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