4.7 vs. 5.7 for fuel efficiancy ? - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 17 (permalink) Old 12-28-2007, 01:32 PM Thread Starter
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4.7 vs. 5.7 for fuel efficiancy ?

Ok - sorry but I'm still the new guy and not trying to start a huge debate but realistic imput would be appriciated. When I order my Commander it will be a every day hauler for me. Will the 4.7 do the job efficiantly or is the 5.7 needed ? In my Grand Cherokee the 4.7 is great and there does not seem to be a huge difference between the two vehicals on paper. In some of the literature they stated that the 5.7 will only deactivate to 4 cylinders between 40 and 60 mph so in being realistic for WI. driving that does not happen very often unless you are driving past Lambeau Field. So is the 4.7 enough and what is realistic gas milage or is the 5.7 needed and what is the realistic gas milage? (no I don't want to drive a Honda either)
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post #2 of 17 (permalink) Old 12-28-2007, 01:56 PM
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I would go with the 4.7 for fuel savings if you are doing a lot of stop and go. Pure highway, both engines are almost the same.

I have the 4.7 and in city driving I can get around 14-15mpg(lite on throttle and forget about beating the next light), highway I average 18-20 mpg(65mph) depending on the terrain and traffic
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post #3 of 17 (permalink) Old 12-28-2007, 02:07 PM
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I you drive around 40 in the 5.7 you can get over around 18-20 mpg. It is better to have too much than too little to get out of a situation. Someone did a gas comparison on here sometime back and it only came to like 77 dollar difference between th 4.7 and 5.7 for a year of driving. Go with the Hemi, you'll love it!
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post #4 of 17 (permalink) Old 12-28-2007, 03:00 PM
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Agreed

I love my XK with the 4.7, but if I could have gotten the 5.7 in the sport, I would have. However, I don't care for the chrome accents or chrome clad wheels on the limiteds, so is was not worth paying more for something I actually disliked.
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post #5 of 17 (permalink) Old 12-28-2007, 04:42 PM
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I have the 4.7 and it's more than enough. If you are towing a trailer than you should consider the Hemi. For the kind of driving I do,mostly city, the Hemi is overkill and with gas prices the way they are who wants to pay more at the pump. In any case I would test drive the 4.7 and Hemi and see for your self.
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post #6 of 17 (permalink) Old 12-28-2007, 04:49 PM
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What will you be towing? what is your on road/off road percentage?
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post #7 of 17 (permalink) Old 12-28-2007, 04:55 PM
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which 4.7l engine? There was the early model ones and the later model ones.
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post #8 of 17 (permalink) Old 12-28-2007, 07:13 PM
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My 08 Hemi (before mods ) got over 18 mpg if I took it easy.

Most will say the 4.7 is enough & they're prob right. But do you want just enough or something that gets very similar mpg and has the ability to move when you put your foot into it? Wheel'n with the Hemi got me through some mud and sand on different occasions that I question my JK would have made it through.

The above is just my opinion. I Hope it helps!
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post #9 of 17 (permalink) Old 12-28-2007, 08:42 PM
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I just drove up to Stevens Point Wisconsin from NC with my 5.7....There is something about a Hemi. I averaged about 18.5 MPGs realistically and enjoy the extra power. It is purely your choice but if you are looking at either is gas mileage really that big a concern? Get the Hemi...You will enjoy the acceleration and the feel of the car.
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post #10 of 17 (permalink) Old 12-28-2007, 08:46 PM
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I would've gotten the Hemi if I could've gotten one without leather seats and still have the skylights. My wife doesn't like the leather seats because they get too hot in the summer time for her legs, and its her daily driver.
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