Is a 4 cylinder really THAT much more fuel efficient than a 6? - JeepForum.com
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Unread 07-06-2007, 10:48 PM   #1
Sourceman
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Is a 4 cylinder really THAT much more fuel efficient than a 6?

I've been looking at various websites and according to them, the highway MPG is identical, while city driving will give the 6 cylinder 2-3 less miles to the gallon. Anyone that has had both can give me some info?

Oh, and right now, I'm looking at a 4" lifted 6 cylinder with 35's and 373's. How many miles to the gallon you think this gets? Would it be much better than it would get if it didn't have those tires?

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Unread 07-06-2007, 10:49 PM   #2
pigeon
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gallons per mile
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Unread 07-06-2007, 10:54 PM   #3
afguy
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No matter what, there isnt going to be much of a difference. With that said, gearing is what is going to make the most difference IMO. If 2 jeeps (one a 4cyl, one a 6cyl) had 35" tires and 4.88 gears, the six cylinder isnt going to work as hard to move the tires.
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Unread 07-07-2007, 12:04 AM   #4
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It is fun per gallon not miles per gallon that matter.

and NO.

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Unread 07-07-2007, 12:47 AM   #5
'B'wigstrailrig
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Youll run the 4cyl. harder to get the performance you want and lose your better gas mileage.
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Unread 07-07-2007, 12:52 AM   #6
Dracunos
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Yeah, but four cylinder Wranglers are better for that one super-secret purpose.
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Unread 07-07-2007, 01:15 AM   #7
ratmonkey
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old coworker has a 4cyl man tj running 37's with 4.88's if i remember right. he claimed 9mpg city, and it never really saw highway as far as i know.

yes, the rest of the vehicle is well equipped to run those tires.
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Unread 07-07-2007, 07:01 AM   #8
hvac59
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I think your milage will be between 11 and 15..........average. Being in the position your in right now, I would "go with what you got!" A 4 cyl. as a DD with 31"s and 4.10"s will give you better by far(if it's kept that way), but it does not sound like that is your intent ! Look at my sig., I have an XJ for a DD and tweaked it for MPG. I'm getting 27 average, and that took some time and money. It is a hobby for fun and I just wanted to see were I could get it to.
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Unread 07-07-2007, 07:05 AM   #9
SJP
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My four cylinder averages 20 MPG around town, and has hit nearly 21 MPG on numerous occasions. After replacing my distributor and wires, I expect that to go up. I haven't done much highway driving with it, but I expect it to be in the 19-20 MPG range.

My six cylinder has hit 18 MPG around town, but I suspect that it averages about 17 MPG. On the highway, it is consistently 19 MPG.

These are both stock setups. With a 4" lift and 35" tires, you increase the rolling and wind resistance, and MPG goes right out the window.
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Unread 07-07-2007, 07:07 AM   #10
Rocky529
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The difference is negligible in my opinion and the power of the I6 compared to the 4 outweighs any MPG differences.
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Unread 07-07-2007, 07:25 AM   #11
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I still average 20 mpg on a tank if i just drive it to work. (18 miles of country 2 lane road and 1.5 miles of city). If it get on highway it drops to 18.5-19.5 mpg.
Mine is a 4.0L 5 sp and has 31s and 3.73. If you want mpg shift it at 2200rpm.
It works for me.
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Unread 07-07-2007, 08:52 AM   #12
hogrider98
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if miles per gallon is your main concern you may want to consider a different
vehicle.

if you can deal with real world average mpg of about 14mpg and you
want to have more fun than should be legal than buy a jeep.

Brian
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Unread 07-07-2007, 08:57 AM   #13
dyna
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Quote:
Originally Posted by Dracunos
Yeah, but four cylinder Wranglers are better for that one super-secret purpose.
Boat anchor? fill me in here.
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Unread 07-07-2007, 08:58 AM   #14
SOFmech
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My 4cyl. with 33's gets around 15-18 MPG depending. It doesent bother me. Its dependable and gets better MPG than my 79 Z28. I have to agree with 7.7stroker - it should be fun per gallon!!
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Unread 07-07-2007, 09:35 AM   #15
2000TJDude
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SOF, what gears are you running with those 33's? I'm thinking about a simular set up with my 98 4 banger.
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