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  #13  
Old 06-23-2011, 10:06 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

Quote:
Originally Posted by jeepin dave View Post
I do not know if the following applies.
When I learned to fly from an old bush pilot, he said that to properly break in a piston aircraft engine, one had to fly at full power part of the time. He said this properly set in the components. His expression was to fly b*lls to the wall.
Otherwise one would get less mileage and lower performance.
Could something like this help explain the difference that people are getting?
Dave
Yes, in my opinion proper break-in makes a huge difference. I baby my engines until they are at full operating temperature during breakin, but once they are warm you need to do frequent full throttle acceleration fairly often. Opinions vary, but if you never run your engine hard during breakin I believe that you will not have a very strong running or economical engine in the log run.
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  #14  
Old 06-23-2011, 11:30 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

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Originally Posted by vikingdave View Post
Yes, in my opinion proper break-in makes a huge difference. I baby my engines until they are at full operating temperature during breakin, but once they are warm you need to do frequent full throttle acceleration fairly often. Opinions vary, but if you never run your engine hard during breakin I believe that you will not have a very strong running or economical engine in the log run.
Yeah, I've heard a lot of different opinions. As long as you don't do anything cold (the horror), I assume that fanging the Hemi around would be good for breaking in the engine (long WOT here we go!)
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  #15  
Old 06-24-2011, 01:57 AM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

I come from an 05 wk 5.7l hemi where I was getting overall 13mpg. I'm getting 18.9 mpg during my first 2 months with the 3.6l v6. Same driving habits, same work commute etc..Not trying to compare the 2 models engines here...

Just trying to put mpg savings into perspective...

If I drive 10k miles a year:
@13 mpg = 769.23 gallons
@19 mpg = 526.32 gallons

At the price of gas at $3.75/gal 10k miles a year:
@13 mpg = $2884.61
@19 mpg = $1973.70

That would equal a savings of $910.91 a year for 6 little mpgs. I don't know if the math works out but in this scenario that's $151.00 in yearly savings per mpg.

When are the wk2 hybrids coming out?
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  #16  
Old 06-24-2011, 08:28 AM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

Quote:
Originally Posted by Bluevw03 View Post
I come from an 05 wk 5.7l hemi where I was getting overall 13mpg. I'm getting 18.9 mpg during my first 2 months with the 3.6l v6. Same driving habits, same work commute etc..Not trying to compare the 2 models engines here...

Just trying to put mpg savings into perspective...

If I drive 10k miles a year:
@13 mpg = 769.23 gallons
@19 mpg = 526.32 gallons

At the price of gas at $3.75/gal 10k miles a year:
@13 mpg = $2884.61
@19 mpg = $1973.70

That would equal a savings of $910.91 a year for 6 little mpgs. I don't know if the math works out but in this scenario that's $151.00 in yearly savings per mpg.

When are the wk2 hybrids coming out?
It's a declining savings though, you will save much more annually going from 13 to 19mpg than you will going from 19 to 24mpg ... It's very much a diminishing return. Using your numbers, going from 19 to 24 Mpg will save about $410/year rather than the $910 that going from 13 to 19Mpg saved. The savings become pretty insignificant when you get into the mid 20's ... You would save about $312 per year going from 24 to 30Mph.
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  #17  
Old 06-24-2011, 01:31 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

Pretty much right on the money!
My JGC with V-6 with just at 12,000 miles
Filled up 31 times spending $2215.58 and have overall average of 18.7 MPG average cost per gallon $3.60

My Dodge Hemi w/MDS Ram 1500
When I traded it in had 63,000 miles on it, I started tracking MPG at 43,500 miles so roughly over 20,000 miles had:
78 fill ups spending $4,400.83 and averaged 12.8 MPG Overall average cost per gallon $2.83.
Of coarse your talking Dodge Ram compared to a JGC but it is same exact engine!
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  #18  
Old 06-24-2011, 02:04 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

Quote:
Originally Posted by fourwheelin7 View Post
Pretty much right on the money!
My JGC with V-6 with just at 12,000 miles
Filled up 31 times spending $2215.58 and have overall average of 18.7 MPG average cost per gallon $3.60
12,000 miles
$2215.58
$3.60 average cost per gallon

would be:
19.5 MPG
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  #19  
Old 06-24-2011, 10:39 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

Sorry mistyped few things on my V-6
Average 18.7 MPG
Max MPG 23.68
Min MPG 14.46
Total Cost $2215.58
Total Miles 11519
Total Gallons 614.65
Total Fill ups 30
Overall Average cost per gallon $3.60
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  #20  
Old 06-24-2011, 10:50 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

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Originally Posted by 1200RT-P View Post
How? I hate to say it, but I don't buy it. Unless you're on flat ground with a tailwind every drive .....

My MPG is much closer to what's quoted in the first post. And this is normal city driving - "auto" mode, etc.
Same here, about 14 city, 22 hwy. V8 4x4.
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  #21  
Old 06-24-2011, 11:17 PM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

Quote:
Originally Posted by jeepin dave View Post
I do not know if the following applies.
When I learned to fly from an old bush pilot, he said that to properly break in a piston aircraft engine, one had to fly at full power part of the time. He said this properly set in the components. His expression was to fly b*lls to the wall.
Otherwise one would get less mileage and lower performance.
Could something like this help explain the difference that people are getting?
Dave

I think it might. For years there has been a theory (during break in), about opening up the throttle for short periods (when motor and trans are warm, of course) and also slowing down with motor; decompression, right after WOT. The manufacturers never advised this. But, now it is in our manuals. Not sure of the exact wording, but basically WOT being part of the break in. Apparently, it helps seat the rings properly to the cylinder walls... piston rings are only forced against the cylinder walls under compression, the more the better, for seating them properly.
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  #22  
Old 06-25-2011, 05:38 AM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

For proper break-in there will be opinions on both sides of the fence. I am on the side of WOT for short periods after the engine reaches operating temperature. So far, no problems.

Here is a website that is referenced on other forums. However, use your best judgement. http://www.mototuneusa.com/break_in_secrets.htm.




Regards,
NHman
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  #23  
Old 06-25-2011, 09:03 AM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

With only 450 miles on the odometer and living and driving in a very hilly city (San Francisco and Bay Area), I'm seeing between 8-10 mpg with my Laredo X with V8. I'm expecting slightly better numbers once the engine breaks in and I stretch its legs...I hope.
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  #24  
Old 06-25-2011, 11:33 AM
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Re: WK2 Hemi vs V6 MPG Compilation (results inside)

im averaging about 16.7 mixed driving but i did a trip from El Paso to Lubbock 462 miles and I did that on one tank. Quiet surprising it was all highway of course. 80 miles an hour on I-10 and I-20. I average a little over 20.1 during that trip.
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