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Well I have been looking at getting a new 2104 GC to replace my 2008 GC with my 4.7L V8 which is going to my daughter. I decided to do a cost analysis after reading so many posts about how expensive the diesel is vs. the Hemi and V6. It peaked my interest so I took a shot at it. Now just to give you all some background. I need a vehicle capable of towing. I have a 19ft boat that I regularly tow around on short and long (1500mi) trips. If you don't need to tow, buy the V6. It will be slightly cheaper, but not by much. What I was most interested in is the Hemi vs. diesel. Now I love the 4.7L motor and if I had to choose, i'd choose it any day over the 50 year old Hemi. It's smooth and quiet. But it's no more, so I now have to decide.

My analysis consist of a comparison of costs on the engines alone. I am assuming the vehicle costs and maintenance are the same. Diesel repair costs are probably higher, but I was not willing to dig into each major repair and compare them. I used 3 main cost drivers for comparison:

1) Oil Change costs
2) DEF costs
3) Fuel mileage costs

I made the following assumptions:
15,000 miles per year
10,000 mile oil changes for diesel
3,000 mile oil changes for V6/V8
Def costs $3.00 gal (Wallmart)
Avg MPG used off CAFE sticker

I also used similar priced vehicles with as equivalent options as i could. Obviously if you stripped the V6 and Hemi way down, you can do better, but in almost no scenario is the old Hemi close to cost effective. The V6 is close as long as gas is cheaper than Diesel. if if swaps, the diesel is more cost effective due to its advantage in mileage.

Mileage is the major driver for sure. I can tell you that my 4.7L never gets above 16 in the city and will not hit 19 on the Highway. 16 for the Hemi is probably decent given it's cylinder cutoff tricks. Just note that none of those cylinder will be cutoff when towing.

Have a look at the screen shot of the Spreadsheet i made. I am glad to email it out if you want to tweak the numbers. As you can see the Diesel has a huge advantage over the Hemi in almost every scenario. The V6 is better, but if diesel drops in price or actual mileage is better, the diesel will come close to edging it out.

Have a look and hope this helps make up your mind....Nick


2014 Jeep GC Cost Analysis.jpg
 

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One thing you may want to play with in your spreadsheet are your maintenance intervals and associated costs with the diesel.

I'm not aware of any diesel owner reporting that they're getting anywhere close to a 10K mile oil change or DEF topoff interval.

Oil life and DEF consumption is highly dependent on driving habits, amount of stop-no-go city driving, terrain, towing, etc. From what I've been reading, there seems to be a fairly large number of people reporting getting the oil change indicator between 3-6K miles. They're also reporting oil change / DEF topoff costs averaging around the $200 mark at the dealership. That's not an insignificant amount.
 

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I agree...I reran the number at a 6000mi oil change with DEF at 5.00 which is available at Walmart all day long. With Disel at $3.99 vs gas at 3.75. The Diesel is still the clear winner on costs over the same time period. Here is the table.

3.0L Diesel 5.7L Hemi 3.6L V6 Cost Savings VS. Hemi Cost Savings VS. Diesel
Year
0 251.45 0 -$6,445.68 -251.45 6697.13
1 $3,375.20 $3,665.63 -$3,335.15 $38.97 $13,407.48
2 $6,498.95 $7,331.25 -$224.63 $871.27 $20,131.06
3 $9,622.70 $10,996.88 $2,885.90 $2,245.45 $26,867.86
4 $12,746.45 $14,662.50 $5,996.43 $4,161.50 $33,617.89
5 $15,870.20 $18,328.13 $9,106.95 $6,619.42 $40,381.14
6 $18,993.95 $21,993.75 $12,217.48 $9,619.22 $47,157.61
7 $22,117.70 $25,659.38 $15,328.00 $13,160.90 $53,947.30
8 $25,241.45 $29,325.00 $18,438.53 $17,244.45 $60,750.22
9 $28,365.20 $32,990.63 $21,549.06 $21,869.88 $67,566.37
10 $31,488.95 $36,656.25 $24,659.58 $27,037.18 $74,395.73
 

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Diesel wins no question if towing. I have owned a 2005 RAM Hemi and this Jeep Diesel. Towing the same 6000lb load Boston to Ithaca NY. Diesel pulls better period.(plus 18mpg vs 10) Now the newest Hemi has more HP, don't know about torque.
The Diesel is also really fun to drive and gets an honest 30mpg highway! Tested! Doesn't sound as good as the Hemi but I have the Camaro for that...:) DEF is cheap and the oil life is at 80% after 2k.
 

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Not to mention that the diesel feels stronger than a hemi at anything less than wide open throttle due to its massive peak torque at 1800 rpm. Add a $350 tuner and it'll spank a Hemi from 0-60 :)
 

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One thing you may want to play with in your spreadsheet are your maintenance intervals and associated costs with the diesel.

I'm not aware of any diesel owner reporting that they're getting anywhere close to a 10K mile oil change or DEF topoff interval.

Oil life and DEF consumption is highly dependent on driving habits, amount of stop-no-go city driving, terrain, towing, etc. From what I've been reading, there seems to be a fairly large number of people reporting getting the oil change indicator between 3-6K miles. They're also reporting oil change / DEF topoff costs averaging around the $200 mark at the dealership. That's not an insignificant amount.
I had the early oil change alert after about 3K miles. However, more recently, the oil change & DEF intervals are within advertised spec. I did, though, purchase the 3 yr. oil change coverage after that initial oil change alert.
 
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