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Unread 01-02-2014, 11:05 PM   #16
richjava
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Join Date: Dec 2013
Posts: 3
So ad2...$1400 savings with 4cyl.... But most won't hit 100k miles for 8 yrs....That's say $150 a year. .... Or $13 per month.... That's not a big difference for most. But Good analysis. ...

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Unread 01-03-2014, 09:02 PM   #17
chartx
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Join Date: Nov 2013
Location: St. Louis, Missouri
Posts: 63
Quote:
Originally Posted by NHPATRIOT View Post
For a 3 MPG average difference to be 3% it would mean you would need to get 100 MPG. 3 MPG difference when you see 22-25 MPG is 12-13%. I "believe", if my math is correct, that a 3 MPG gain over 22 MPG would be a 13.6% increase. So the 4cyl gets approx. 13% better MPG on average than the 6cyl.

To get the figure I believe you divide the difference( 3 MPG ) by the lower MPG figure( 22 ) to get the % increase. So 3 / 22 = 0.136 or 13.6%. I may be wrong on how you come up with the % for the difference but I think it is right. My head hurts.

IMO a 3 MPG difference, when the vehicles only average in the low to mid 20's, is quite significant. The only Cherokee model where the MPG difference is so minor that the 4 cyl really doesn't make sense from a MPG standpoint, at least IMO, is the TH( or if you do almost all highway - see below ).

2.4L TH = 19/25
3.2L TH = 18/25

On the non TH models it is 2-3 MPG better with the 4cyl on average. That adds up over time with what gas costs these days. While the highway MPG may only be off 1 MPG in the 4WD models( and not 3 MPG as with FWD ones )the city and average MPG is off 2 MPG. For most folks city makes up most of the driving and effects the average MPG a lot. If you do mostly highway the 6cyl may not impact your MPG as much although I would wager you could easily increase the difference between the 2 engines over the EPA rating with conservative driving.

FWD Non TH:
2.4L = 22/31/25
3.2L = 19/28/22

4WD ADI Non TH:
2.4L = 21/28/24
3.2L = 19/27/22

4WD ADII Non TH:
2.4L = 21/27/23
3.2L = 19/26/21

100,000 miles / 25 MPG = 4000 gallons of gas X $3.50 = $14,000.00

100,000 miles / 22 MPG = 4545.5 gallons of gas X $3.50 = $15909.25

Over 100K you spend $1909.25 more for fuel in FWD model, when gas is at $3.50, running the 6cyl vs the 4cyl if you see the EPA rated average MPG. As the cost of fuel rises over that $3.50 mark the difference increases fast as well. That is a lot of coin in my book.

Even if you drop back to the 2 MPG difference in the 4WD non TH's it is still a lot of coin...

ADI:
100,000 miles / 24 MPG = 4166.7 gallons of gas X $3.50 = $14,583.45

100,000 miles / 22 MPG = 4545.5 gallons of gas X $3.50 = $15909.25

ADII:
100,000 miles / 23 MPG = 4347.8 gallons of gas X $3.50 = $15,215.30

100,000 miles / 21 MPG = 4761.9 gallons of gas X $3.50 = $16,666.65
The only problem with your analysis is you use EPA numbers. EPA highway testing is for around 50mph, most people drive faster. 4 cylinder may have good numbers for 50mph, but 70-75 mph, V6 can be running lower rpm than V4 requires, which would cause closer mpg numbers.

In city EPA testing doesn't replicate too much stop and go traffic. So in city EPA is way off for many cars.

In my previous experience with Jeep; it is easy to get close to stated highway mpg numbers and usually way off in city.

I use often automobile-catalog.com numbers to see what to expect from a new car. Their numbers are usually very conservative, don't create surprises.

Both for 2WD
MPG: 2.4 3.2

extra-urban 22.2-28.4 19.3-24.6
city 14-17.9 11.2-14.3
highway 20.4-24.8 18.6-22.7
average combined 20.5 17.1

Source: http://www.automobile-catalog.com/auta_perf1.php (3.2L)
http://www.automobile-catalog.com/auta_perf1.php (2.4 L)

For me, V6 0-60 times 7.1 secs compared to 4 cyl 0-60 time of 8.8 secs, is enough to convince on V6. I do though drive mostly on highways with little in city driving.

I would definitely see why 4 cyl would be better choice for many people as you highlighted the cost difference.
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Unread 01-04-2014, 08:01 AM   #18
NHPATRIOT
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Join Date: Aug 2011
Location: Exeter, NH
Posts: 363
Quote:
Originally Posted by chartx View Post
The only problem with your analysis is you use EPA numbers. EPA highway testing is for around 50mph, most people drive faster. 4 cylinder may have good numbers for 50mph, but 70-75 mph, V6 can be running lower rpm than V4 requires, which would cause closer mpg numbers.

In city EPA testing doesn't replicate too much stop and go traffic. So in city EPA is way off for many cars.

In my previous experience with Jeep; it is easy to get close to stated highway mpg numbers and usually way off in city.

I use often automobile-catalog.com numbers to see what to expect from a new car. Their numbers are usually very conservative, don't create surprises.

Both for 2WD
MPG: 2.4 3.2

extra-urban 22.2-28.4 19.3-24.6
city 14-17.9 11.2-14.3
highway 20.4-24.8 18.6-22.7
average combined 20.5 17.1

Source: http://www.automobile-catalog.com/auta_perf1.php (3.2L)
http://www.automobile-catalog.com/auta_perf1.php (2.4 L)

For me, V6 0-60 times 7.1 secs compared to 4 cyl 0-60 time of 8.8 secs, is enough to convince on V6. I do though drive mostly on highways with little in city driving.

I would definitely see why 4 cyl would be better choice for many people as you highlighted the cost difference.
MPG varies by driver as we all know. All you can do when making a general MPG point is use the EPA ratings as a baseline/start point. It is what most folks expect a vehicle to do so it is where I start these conversations.

I actually exceed the EPA ratings pretty much always in my vehicles. Very few that I don't and in those I see pretty much spot on. I haven't ever got below EPA ratings.

My 2011 Patriot is a perfect example of me exceeding the EPA ratings. Despite it only being rated to 26 MPG highway I routinely break 30 MPG with it and have seen as high as 35.8MPG with how I drive highway( use CC and go 60 MPH ). On a trip from NH to VA and back in Sept 2013 I averaged 31 MPG for the 1600 mile+ trip.
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Unread 01-07-2014, 05:49 AM   #19
Radamacher
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Join Date: Jan 2014
Location: Bayside, NY
Posts: 2
Quote:
Originally Posted by whitebomber View Post
I was all set to get the 4cyl and even had the deal all written up. Just needed to decide the color as they had the identical Cherokees of various colors.

For two days I was excited and trying to decide on the color. But something was just bothering me and one night I realized it was the 4cylinder. While I knew it would be more then adequate, I realized that was my one hesitation.

So went in the next day and bought the V6 in silver. I knew I would never regret getting the 6cyl but knowing "me", I knew I could regret not getting it.

Now that I have it, it's very cool...
Me too, I tested a 4 with the AC on going up a steep hill, and I knew it wasn't going to cut it.
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