Gas mileage so far

[Smarrtazz]

Yes. The Duellers are mild rolling-resistance AT tyres, the KMs have much higher resistance (which is typical for MTs). The JK Rubi KM tire combo (tyre+rim) are also slightly heavier too.

As for the rating, especially in the JK where you had 3 axle ratios, 3 trim weight classes, 2 different tops (3 in the JL), multiples tyre options (all before Special Editions), certifying for all combos is unrealistic.

Sponsored

 

[Dynomite1371]

That's the inl

Are you guys doing a manual calculation from the pump as well? How far is the trip computer off from the manual calculation?

That's the only way to do it, using the computer gives you real time. I'll know in the Am. This is my second filling coming, the first one I thought I reset the trip but didn't..

 

[Dynomite1371]

And let's all be honest, we don't buy these things for milage. On a side note maybe @The Grape Ape can chime in, but my first fill up was prior to coming home from about 70 miles away from my home, all highway with a 70 mph speed limit. I was keeping it around 71/72 and used some cruise control. Upon checking the computer on the way home I noticed I was averaging 19 mpgs. I did fill up the first tank with mid grade. I drive some highway everyday to work and have not seen 19mpg since..... Could that have anything to do with the gas I used? @thegrapeape

 

[Smarrtazz]

And let's all be honest, we don't buy these things for milage. On a side note maybe @The Grape Ape can chime in, but my first fill up was prior to coming home from about 70 miles away from my home, all highway with a 70 mph speed limit. I was keeping it around 71/72 and used some cruise control. Upon checking the computer on the way home I noticed I was averaging 19 mpgs. I did fill up the first tank with mid grade. I drive some highway everyday to work and have not seen 19mpg since..... Could that have anything to do with the gas I used? @thegrapeape

Which grade should we use?

 

[cobra]

If you’re using a gas/ethanol blend it’s going to have a negative effect on mileage. Around here 10% blend is everywhere and pure 100% gas harder to find. It’ll account for a couple of miles per gallon difference. What are you using?

You also can't be sure how much corn they are pumping. A dealer close to me had complaints of poor fuel mileage, people were buying fuel at the same station. They went and tested their fuel and found they were pumping 22% ethanol

 

[JHJLUR]

Which grade should we use?

i believe its spec'd for low grade, anything more will not increase mileage, actually may be worse.

 

[Covfefe]

C'mon guys, it's all about smiles per gallon! Big tires is like walking around with a big swinging flaccid bulge. Feels greaT!

 

[Smarrtazz]

i believe its spec'd for low grade, anything more will not increase mileage, actually may be worse.

Thank you

 

[The Great Grape Ape]

@Dynomite1371 , your fuel economy will change based on the grade/octane, and also ethanol content (in addition to other things like altitude changes, wind reistance, road grade, ambient temp, etc) but fuel wise, higher octane should get you a small.. very small boost in MPG, but ethanol will rob you of even more efficiency.
While real world might not change significantly, the calculations of the engine computer and resultant EVIC avg/estimate might change the calculations. I know that one many vehicles I’ve owned and rented changing the Octane fuel will recalibrate the DTE without driver intervention, so the comouters are definitely taking it into account if they can sense the difference.

Again I think the impact would be over-estimated by the system and real-world would likely be closer among the various octane levels.

Also beware of cheaper winter fuel additives from cheap stations, all winter gas greatly impact fuel economy despite having the same octane rating, I don’t trust the cheap station to not take shortcuts. I tend to go with my top fuel choices in the winter, and don’t care as much in the summer.

 

[giangvann]

As for the rating, especially in the JK where you had 3 axle ratios, 3 trim weight classes, 2 different tops (3 in the JL), multiples tyre options (all before Special Editions), certifying for all combos is unrealistic.

And let's all be honest, we don't buy these things for milage.

After I had posted, I thought about it for a second and remembered how many special editions there were. While you're right it is a little unrealistic, it's all about informed decisions. And yeah, we're not buying these things for gas mileage, but it's nice to know how bad it really is. I'll say, the gas mileage estimates with the Duelers on my Sahara were pretty spot on. I didn't expect changing the tires would hurt it that badly. I'm still happy with my Wrangler... though that JL is look nice!

Also, I did a quick search and found this:

https://www.jeep.com/jeep-capabilities/fuel-efficiency.html

It lists mileage per trim package and pretty much lists the same for all. It's a little misleading/false if anything. Though there is a "2" that covers them... Actual mileage may vary. Haha. I'll shut up before someone throws rocks at me.

 

[The Great Grape Ape]

Which grade should we use?

87 is perfectly fine for the 3.6L.

 

[Smarrtazz]

@Dynomite1371 , your fuel economy will change based on the grade/octane, and also ethanol content (in addition to other things like altitude changes, wind reistance, road grade, ambient temp, etc) but fuel wise, higher octane should get you a small.. very small boost in MPG, but ethanol will rob you of even more efficiency.
While real world might not change significantly, the calculations of the engine computer and resultant EVIC avg/estimate might change the calculations. I know that one many vehicles I’ve owned and rented changing the Octane fuel will recalibrate the DTE without driver intervention, so the comouters are definitely taking it into account if they can sense the difference.

Again I think the impact would be over-estimated by the system and real-world would likely be closer among the various octane levels.

Also beware of cheaper winter fuel additives from cheap stations, all winter gas greatly impact fuel economy despite having the same octane rating, I don’t trust the cheap station to not take shortcuts. I tend to go with my top fuel choices in the winter, and don’t care as much in the summer.

So, the lower grade is good as long as you choose a reputable station?

 

[Smarrtazz]

87 is perfectly fine for the 3.6L.

Thank you! This is good! I currently have to put 93 in my Lexus.

 

[BillyHW]

So, the lower grade is good as long as you choose a reputable station?

Here is a list of the more reputable stations:

http://www.toptiergas.com/licensedbrands/

 

[jeppesen.io]

Only have 80 miles on the clock but this is what I saw on a Rubicon 4dr. No idea what gas the dealer put in the tank.

1) In town ~15 MPG
2) On the freeway ~62 MPH, without cruise control ~17 MPG
3) On the freeway 62 MPH, with cruise control ~21 MPG

I come from a Miata (and other cars with low drag coefficient) which is very easy to keep at a constant speed. I found it very hard to do the same in the JL. Not sure if I just need to get used to that floaty-truck feel or if being a big box makes it harder. Either way, I bet I just need some practice.

Sponsored