4 cyl vs 6 cyl... better gas mileage? - JeepForum.com
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post #1 of 37 Old 06-11-2008, 07:50 PM Thread Starter
PSYCH0
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4 cyl vs 6 cyl... better gas mileage?

What gets better gas mileage the 4 cyl or 6 cyl 5 speed?

I assume the 4 cyl but is the trade off in power from the 6 cyl worth the 1-2 mpg savings?


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post #2 of 37 Old 06-11-2008, 08:02 PM
xxxflhrci
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If you plan on keeping it stock and want the extra 2 mpg, get a four banger. With a lift and larger tires, the mileage advantage of the 4 banger disappears.
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post #3 of 37 Old 06-11-2008, 08:12 PM
BENG
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It's usually 2-4mpg. Difference is if I run my 4 cyl Jeeps hard on the throttle it doesn't matter. I can't seem to keep my foot out of the throttle on my six, and that becomes a problem!

So I say, yup get the 4 banger.
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post #4 of 37 Old 06-11-2008, 08:12 PM
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i have a 4cyl my buddy has a 6cyl, both w/33s and 4:10s, we get the same MPG
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post #5 of 37 Old 06-11-2008, 08:26 PM
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Quote:
Originally Posted by xxxflhrci View Post
If you plan on keeping it stock and want the extra 2 mpg, get a four banger. With a lift and larger tires, the mileage advantage of the 4 banger disappears.
What he said.
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post #6 of 37 Old 06-11-2008, 10:51 PM
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One thing, though, is that on the trail there seemed to be a significant milage difference. A friend and I calculated TRAIL milage and came up with these figures:

Offroad:

6 cyl = 4.2 mpg
4 cyl = 7.2 mpg



On road he got better milage but not by much. Personally, our Jeeps get such crappy milage anyways that the 1-2 mpg saved isn't worth the lower power rating.

And I'd agress with xxxflhrci. If it's bone stock on those small stock 28's and will never be modded the 4 cyl is fine. Otherwise . . .

- Jay
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post #7 of 37 Old 06-12-2008, 03:24 AM
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like he said at putting speeds in the woods the 4 is going to give you substantialy better milage but at highway speeds its about a wash.
Quote:
Originally Posted by lupinsea View Post
One thing, though, is that on the trail there seemed to be a significant milage difference. A friend and I calculated TRAIL milage and came up with these figures:

Offroad:

6 cyl = 4.2 mpg
4 cyl = 7.2 mpg



On road he got better milage but not by much. Personally, our Jeeps get such crappy milage anyways that the 1-2 mpg saved isn't worth the lower power rating.

And I'd agress with xxxflhrci. If it's bone stock on those small stock 28's and will never be modded the 4 cyl is fine. Otherwise . . .
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post #8 of 37 Old 06-12-2008, 05:09 AM Thread Starter
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Looking for it to be a daily driver to and from work in PA... about 50 miles round trip up and down hills all the way to and from...

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post #9 of 37 Old 06-12-2008, 05:54 AM
MudBox
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get the six if your going to do any kind of oversized tires and then drive up and down hills

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and I keep a portable jump system in my rear during winter just in case!
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post #10 of 37 Old 06-12-2008, 05:56 AM
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wheel the wrangler, get a compass or patriot or liberty for DD commuting....
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post #11 of 37 Old 06-12-2008, 06:17 AM
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post #12 of 37 Old 06-12-2008, 08:20 AM
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just get a 6-cyl w/ D44 rear so when its not enough power all you have to do is buy a stroker kit. if you get the 4-cyl, you'll have to do a more expensive motor swap and possible axle swaps.
+1. Even the4.0L is slow. Jeeps are heavy and have the wind resistance of a sheet of plywood. Up a very slight grade into a headwind i was floored in 4th to keep up with traffic.
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post #13 of 37 Old 06-12-2008, 09:11 AM
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Jeeps are heavy and have the wind resistance of a sheet of plywood.
I don't know why but I laughed out loud
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post #14 of 37 Old 06-12-2008, 09:47 AM
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A data point for you...

I have a 1997 TJ 4 cyl 5 spd on 33's w/4.10's
and a 1997 TJ 6 cyl 5 spd on 32's w/3.07's

Both consistantly get 20 mpg. Driven as DD's 40-65 on flat roads.

Hands down the 6 cyl is the better choice for power and acceleration.
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post #15 of 37 Old 06-12-2008, 10:06 AM
BucketOKarma
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Go with the 6, trust me, I have the 4-banger..... If you have to be doing anything with hills, and if your ever running late you will not want to be flooring it and barely moving. I wish I got the 6, I was stupid and thought "4cyl=better gas" but my (ex) wife's 6cyl gets the same mpg on flat ground, and better mpg on hills, and when going up hill she can keep her speed while I start to lag behind.

2000 2.5L 5spd 4.88, HP D30 w/OX, D35 open, 3" "FrAnKeNLiFt" with some stuff... LOOKING FOR Willys Edition TJ rear seat! to match the fronts.

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http://groups.jeepforum.com/CT_Jeeps
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