The great octane debate: 2.0 Turbo owners - What grade gas do you use?

The great octane debate: 2.0 Turbo owners - What grade gas do you use?


  • Total voters
    189

jason0341

Well-Known Member
First Name
Jason
Joined
Aug 21, 2019
Messages
406
Reaction score
1,018
Location
Colorado
Vehicle(s)
2020 2.0L Rubicon
I run 91 all the time. We only have 85 or 91 at Costco. I sure as hell won’t run 85. Ever.
Same here but always curious about 85 since 85 acts like 87 at altitude. I mean all other 87 octane gas vehicles use 85 all the time around here with no issues.





Advertisement

 

Spdu4ia

Well-Known Member
First Name
Travis
Joined
Mar 21, 2020
Messages
360
Reaction score
1,054
Location
Colorado
Vehicle(s)
2020 2dr
Same here but always curious about 85 since 85 acts like 87 at altitude. I mean all other 87 octane gas vehicles use 85 all the time around here with no issues.
wondered this as well here since we have 85 as our lowest. The altitude makes the higher octanes less effective ( if i read that right). i still run the 87 just because but worth a thought
 

Chupacabra

Well-Known Member
First Name
John
Joined
Oct 13, 2020
Messages
186
Reaction score
233
Location
Littleton, CO
Vehicle(s)
2021 JLU
Same here but always curious about 85 since 85 acts like 87 at altitude. I mean all other 87 octane gas vehicles use 85 all the time around here with no issues.
The equation changes with a turbo though as you're no longer running "at altitude" since the turbo is compensating for the altitude loss to a good degree. For a NA engine, 85 is like 87 at sea level I suppose but I don't think that necessarily hold true with forced induction.

That being said, I did run 85 in my 2.0 this tank because it's cold and I'm not towing and I'm not going over any mountain passes. Seems to run fine, no knocking, etc.
 

SSWIM

Well-Known Member
First Name
Sam
Joined
Jun 24, 2020
Messages
56
Reaction score
109
Location
Colorado
Vehicle(s)
Too Many
If one hears any detonation they better get it to the dealer asap cause you got issues Lucy. Like was posted above, the computer monitors the engine and has knock sensors that will send info to the ECU which in turn will pull timing to eliminate any detonation. Detonation in a turbo engine is NOT pretty.

Sam
 

jason0341

Well-Known Member
First Name
Jason
Joined
Aug 21, 2019
Messages
406
Reaction score
1,018
Location
Colorado
Vehicle(s)
2020 2.0L Rubicon
The equation changes with a turbo though as you're no longer running "at altitude" since the turbo is compensating for the altitude loss to a good degree. For a NA engine, 85 is like 87 at sea level I suppose but I don't think that necessarily hold true with forced induction.

That being said, I did run 85 in my 2.0 this tank because it's cold and I'm not towing and I'm not going over any mountain passes. Seems to run fine, no knocking, etc.
Keep me posted if you could. We live in the Same area. Thanks
 

N875ED

Well-Known Member
First Name
Mark
Joined
Nov 6, 2020
Messages
48
Reaction score
93
Location
Lebanon, OH
Vehicle(s)
2021 JLU 80th Anniversary
The 2021 Owners manual recommends 87, with higher octane suggested for towing/extra power.
 

srt20

Well-Known Member
Joined
Mar 5, 2019
Messages
180
Reaction score
248
Location
Wisconsin
Vehicle(s)
JLUR Ocean Blue
You might want to do some research on turbos and altitude and octane before you start using 85 octane all the time in a forced induction engine. At any elevation.
 

4doorturbo

Well-Known Member
First Name
Tyler
Joined
Dec 4, 2020
Messages
99
Reaction score
113
Location
Orlando, FL
Vehicle(s)
2021 JLU Sport S
Just picked up my 2021 and have only used 93 octane so far. Good to know 87 is giving some people better MPG. I'll have to give it a try!
 

ZenWorld

Well-Known Member
Joined
Mar 7, 2019
Messages
59
Reaction score
52
Location
Los Angeles
Vehicle(s)
2019 Jeep Sahara, 2019 Tacoma TRD Pro
2019 Here and read the manual. I run 87 when I'm in the city and the temperature is nice and cool. When taking my Jeep offroad or putting her to work on mountain passes I like to take 91 for the (extra added) power. I find she runs better with 91 and also it's more of a peace of mind thing for me.
 

Chupacabra

Well-Known Member
First Name
John
Joined
Oct 13, 2020
Messages
186
Reaction score
233
Location
Littleton, CO
Vehicle(s)
2021 JLU
Keep me posted if you could. We live in the Same area. Thanks
Didn't seem to have any noticeable impact, but I am going to try and always use at least mid-grade (87) or premium (91) in Colorado. If I go to Sams or Costco they only have 85/91, so i get 91 as it's the same price as 87 everywhere else generally.
 

BigGreen

Well-Known Member
First Name
Al
Joined
Jul 11, 2019
Messages
542
Reaction score
764
Location
Arizona
Vehicle(s)
JL Sport
If one hears any detonation they better get it to the dealer asap cause you got issues Lucy. Like was posted above, the computer monitors the engine and has knock sensors that will send info to the ECU which in turn will pull timing to eliminate any detonation. Detonation in a turbo engine is NOT pretty.

Sam
Detonation is completely normal according to the other octane threads.
 

Twojayhawks

Well-Known Member
First Name
Bill
Joined
Aug 30, 2020
Messages
72
Reaction score
135
Location
Lenexa Kansas
Vehicle(s)
2021 JLU Sport Altitude
Occupation
business owner
91 is the highest available at the stations I use in my neck of the woods. I used 91 first couple fill ups & went to 87 after that as I knew I would. My average mpg is almost 25 using a soft foot.
 

SSWIM

Well-Known Member
First Name
Sam
Joined
Jun 24, 2020
Messages
56
Reaction score
109
Location
Colorado
Vehicle(s)
Too Many
Detonation is completely normal according to the other octane threads.
Some is going to happen. But if it is not keep in check, catastrophic failure WILL occur. I know, it has happened to me.
 

Advertisement




Chrysler Factory Warranty
 



Advertisement
Top