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I was wondering if jeeps 4L 6 cylinder would have better millage than nissans 3L v6, because the engine with more power would not have to work as hard, therefor it does not use as much fuel. does this theory make any sense? please bare with me, as I am new to this whole thing.

Note: This is mainly for highway driving

Any comments are welcome. THANKS!!

KPD
 

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sorry to bust your bubble but the answer is NO a Jeep 4.0L will be good for 16 MPG or so A Nissan 3.0 should deliver 19 or so. Ask anybody who owns one and they will tell you jeeps are gas hogs. But maby I being too picky anything less than 24mpg is a gashog in my book.
 

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gas mileage

my brother had jeep comanche pu with the 4.0 and 2 other jeeps with same engine. those eingines are incredible for reliabilty and mileage for the power they deliver if they are in tune. we got 24mpg on hiway long trips with the comanche and roun 18 on short trips to werk and back. and that was with 150,000 on it. the 4.0 jeep motor is one of the best designed motors ive ever seen.
 

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I have had a few Jeeps with the 4.0 and I think they get pretty darn good gas milage. There are several factors that determine your MPG such as the weight of the vehicle compared to the engine size, gearing etc... A lighter weight SUV will use less gas than a heavier one with the same engine, a heavier suv with a small engine will most likely eat the gas. A jeep cherokee Classic/Sport is a unibody SUV which is fairly light. I would say my cherokee sport was getting every bit of 20-22 on the highway and maybe even more. I did have a little taller tires on it which changed the gearing but it was still good before I did this. Now my V8 grand cherokee is a totally different beast.
 

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As your topic says "Does more power always mean poor milage"

No not always. My wife drives a 2003 Dodge Durango SLT 4x4, it has three ranges- 2x4, 4x4 high and 4x4 low. It has the 4.7L V8 and a 5 speed automatic transmission, 3.55 rear gears, tow package and power everything.

I drive a 2005 Dodge Durango SLT. Its also has three ranges- "all wheel drive" with 4x4 Lock and 4x4 low lock. Mine has the 5.7L Hemi and a 5 speed automatic transmission, 3.55 rear gears, tow package and power everything.

The 4.7L makes 230 HP and 290 FT. LBS. of Torque.
The 5.7L makes 345 HP and 370 FT. LBS. of Torque.

My 2005 weighs 5200 LBS. I'm not really sure how much the 2003 weighs, but I know its not as heavy as the '05. They get the same milage!, 12 MPG in the city and if I set the cruse at 70 MPH they'll get 19 MPG on the high way.

If I'm pulling our trailer with all our ATV's on it, the '05 gets a lot better milage. It will only down shift one gear on the hills. The '03 will down shift at least two gears (sometimes turning 5000 RPM's) going up the same hill the '05 go's right up with ease. On a flat stretch of highway towing the loaded trailer the '05 will turn 2000-2100 RPM's at 70 MPH. The '03 will turn at least 2600 RPM's at 70 MPH.

If you look at Dodge's window stickers for both, they have the 4.7L getting 14 city / 18 high way and the Hemi getting 13 city / 18 high way. Sometimes more power is better.
 

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Seems several here drive jeeps with the 4.0s. My wife has one and I am wondering if anyone knows anyway to improve mileage she currently gets 13-16 mpg mostly 15-20 mi trips. With the new gas prices she is now pushing for more mileage true before prices went up we had to have an SUV because "we need the room" now she is missing her car I am wondering if there is something I can do so that I dont have to go through the whole buying and selling thing. I did a tune up 12000 miles ago recently changed air filter and o2 sensor checks fine any ideas
 
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