DellCook

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Joined
Apr 23, 2020
Messages
104
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168
Location
St Augustine, FL
Vehicle(s)
'19 JLUR (Sold FEB21); '21 392 (ordered 23NOV20)
Not at all. I drive in the mountains often and depending on where you start and end, I can get 30-35 MPG pretty easily. This single test does not show the V8 gets better mileage than the V6.
This fella says he got around 17mpg from IL to NJ... not too shabby, IMO.






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Brosef

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First Name
Michael
Joined
Jan 28, 2019
Messages
97
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127
Location
Chicago
Vehicle(s)
2018 JL
Silly test. Good luck getting those results at sea level with some hills and regular driving. Altitude has a big impact

having said that, I’ll bet you could get over 20mpg though with the cruise pinned at 60-65.
 

JJMalone

Active Member
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John
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Mar 4, 2020
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Location
Eugene, Oregon
Vehicle(s)
'20 2dr Rubicon, '00 Tacoma TRD
The force required maintain a JLU at highway speed will be the same no matter what drive train all else being equal (same tires and lift, sans roof racks, rocket boxes and other aerodynamic impediments) as total drag will be mostly from pushing air. The drive train in the 392 would take a little more power to overcome all internal frictions as there are more and larger bearings, more volume oil pump, etc. I fully expect my 392 to get fairly good mileage. My C6 Z06 with LS7 (427 cu in) engine did not get noticeably worse mileage than my C5 Z06 LS6 (350 cu in), both could be driven for mileage and easily get 30mpg. Lots of cars with big motors get fairly good gas mileage as long as they are running in the rpm zone where they run most efficient (and ya keep ur foot out of it!)
 

BCMgunner

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First Name
Eli
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Nov 24, 2020
Messages
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Location
Texas
Vehicle(s)
2020 G550 1.5” lift in 33” Ridge Grapplers
I’m getting 12.7 mixed Highway/city on 37’s with a light to medium foot.
4cylinder mode light lights Up on the dash during Highway driving
 

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