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  #289  
Old 04-10-2016, 07:52 PM
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Re: For those who drive a Hemi 5.7

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Originally Posted by JTS97Z28 View Post
Just a note since we are on mpg's, for those that go based off the dashes mpg readings, that is not 100% accurate. You need to hand calculate or use one of those cool apps (love my fuely app) to get the right number. The Grand Cherokees dash will show 1-1.5mpg more than its actually getting. This applies to both the V6 and V8 and its been a consistent trend in all three of my WK2's. As an example my last tank on my '15 High Altitude V6 showed 21.3 at time of fillup. That tanks actual mpg was 20.3mpg. Thats assuming resetting it at each fillup only.
I've yet to find any vehicle where the on board computer for average mpg was accurate. They are always optimistic. But at least the trip odometer and odometer are dead accurate. Wish I could say the same for my 2014 Harley. Reads about 4.5% to fast on both meters.

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  #290  
Old 04-10-2016, 08:03 PM
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Re: For those who drive a Hemi 5.7

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Originally Posted by Action View Post
Great post.

Not considering the v6 at all. Either the Hemi 5.7 or SRT ... or just an entirely different car.

Just wanted to see what the gas mileage numbers were to calculate long term costs.

Obviously it's a rough $ estimate considering gas prices can change - but I don't see it moving too crazy in this current global climate + electrical and economical car sales rising + cars becoming more efficient.

I test drove the SRT and the v6 - haven't test drove the 5.7 yet.

However that SRT MPG is atrocious from what I've seen. + about $15k - $20k more for the car.
One thing to keep in mind between the 5.7 summit and the SRT is that they are very different vehicles. The SRT is an on road monster but is not intended for off road use. Though not a Rubicon rock crawler the 5.7 summit has a decent off road ability. So if you don't need that off road ability definitely go with the SRT but if you need to maintain that off road ability the 5.7 summit is a good choice to consider, the 5.7 is by no means fast or certainly anywhere near an SRT in performance but its ok and adequate for the heavy GC. I mention this because there is a guy on here that bought an SRT but didn't fully understand the vehicles before he bought them and he ended up trading his SRT in on a 5.7 summit not long after he bought it because he needed the off road ability of the 5.7 Summit. I would have loved to have the 6.4 and if the SRT was off road worthy I would have got that but I need the off road ability so 5.7 summit is the next best IMO and keep the off road ability.

on another note since you mention an entirely different car, my sister who was GC shopping just got a GLS550, I think a 15, beautiful vehicle with great ride and v8. she said the audi Q7 felt like riding in a truck and the GLS550 was a world of difference in the ride, and handled good for the mega size it is and smooth cruiser even sitting on the 21" rims. So if you need something that large she is just thrilled with it may be something to look at.
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  #291  
Old 04-11-2016, 02:10 AM
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Re: For those who drive a Hemi 5.7

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Originally Posted by JTS97Z28 View Post
Just a note since we are on mpg's, for those that go based off the dashes mpg readings, that is not 100% accurate. The Grand Cherokees dash will show 1-1.5mpg more than its actually getting.
In my case that still equates to over 20 MPG for a heavy SUV with a 350 C.I. V-8. I've never gotten that in my life. My 302 C.I. V-8 in my F-150 gives me 13 to 14 tops. If I push it over 75, it will drop to 10 or less.
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  #292  
Old 04-11-2016, 08:52 AM
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Re: For those who drive a Hemi 5.7

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Originally Posted by billt View Post
In my case that still equates to over 20 MPG for a heavy SUV with a 350 C.I. V-8. I've never gotten that in my life. My 302 C.I. V-8 in my F-150 gives me 13 to 14 tops. If I push it over 75, it will drop to 10 or less.
I agree with you on that, mileage was not one of my buying points but I have been a bit surprised with the decent mileage this heavy v8 suv has been returning over the past 3 years. This is also one of the most accurate evics I have had on a vehicle. no evic is dead on accurate but this one has always been within 1 mpg which I consider pretty good as far as evics go. The other item that surprises me is the tire pressure sensors always agree with my tire gauge which is a good one that counts to the .1 I have never had a vehicle before where the pressure sensors consistently agreed with a tire gauge. I guess precision in everything continues to get better and better as time goes on.
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  #293  
Old 04-11-2016, 09:13 AM
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Re: For those who drive a Hemi 5.7

I think to a large degree, the aerodynamics have a lot to do with it. I know a Jeep Grand Cherokee doesn't seem very aerodynamic, but it really is when compared to my F-150. The 90's models of the F-150 were like trying to push a 4' X 8' sheet of plywood through the air. At 70+ MPH it just kills any fuel economy.
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  #294  
Old 04-11-2016, 09:26 AM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by JTS97Z28 View Post
Just a note since we are on mpg's, for those that go based off the dashes mpg readings, that is not 100% accurate. You need to hand calculate or use one of those cool apps (love my fuely app) to get the right number. The Grand Cherokees dash will show 1-1.5mpg more than its actually getting. This applies to both the V6 and V8 and its been a consistent trend in all three of my WK2's. As an example my last tank on my '15 High Altitude V6 showed 21.3 at time of fillup. That tanks actual mpg was 20.3mpg. Thats assuming resetting it at each fillup only.
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Originally Posted by BobsWK2 View Post
I've yet to find any vehicle where the on board computer for average mpg was accurate. They are always optimistic. But at least the trip odometer and odometer are dead accurate. Wish I could say the same for my 2014 Harley. Reads about 4.5% to fast on both meters.
I was a long time skeptic of dash board MPG readings myself.
It's a popular misconception that EVIC is inaccurate compared to hand calculating MPG. The problem with hand calculating is that you will never "fill" the tank" to the same level every time. There will always be air pockets in your tank, and depending on a multitude of variables you will always have differing amounts that will be "full tanks".


If you don't reset you trip computer after each fill up (I never reset trip B)... let it run across 5-6 tanks and then compare to your aggregate hand calculated MPG based on fill ups. You will be surprised at how much closer the numbers are. In my case usually dead on or .1 +/-
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  #295  
Old 04-11-2016, 09:32 AM
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Re: For those who drive a Hemi 5.7

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Originally Posted by Blkfenders View Post
I was a long time skeptic of dash board MPG readings myself.
It's a popular misconception that EVIC is inaccurate compared to hand calculating MPG. The problem with hand calculating is that you will never "fill" the tank" to the same level every time. There will always be air pockets in your tank, and depending on a multitude of variables you will always have differing amounts that will be "full tanks". If you don't reset you trip computer after each fill up... let it run across 5-6 tanks and then compare to your aggregate hand calculated MPG based on fill ups. You will be surprised at how much closer the numbers are. In my case usually dead on or .1 +/-
Agree 100%. And not only that, I seriously doubt the accuracy of the gas pumps themselves. Especially the older one's. The way the government operates today, I have zero faith in that sticker they plaster on the side of the pump. Especially if the idiots employed to do it come from the same "stock" as those who work for the TSA. They couldn't catch a loose dog in an airport.
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Old 04-11-2016, 10:07 AM
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Re: For those who drive a Hemi 5.7

Quote:
Originally Posted by Blkfenders View Post
I was a long time skeptic of dash board MPG readings myself.
It's a popular misconception that EVIC is inaccurate compared to hand calculating MPG. The problem with hand calculating is that you will never "fill" the tank" to the same level every time. There will always be air pockets in your tank, and depending on a multitude of variables you will always have differing amounts that will be "full tanks".


If you don't reset you trip computer after each fill up (I never reset trip B)... let it run across 5-6 tanks and then compare to your aggregate hand calculated MPG based on fill ups. You will be surprised at how much closer the numbers are. In my case usually dead on or .1 +/-
That's a good point I'm going to give that a try
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  #297  
Old 04-11-2016, 11:36 AM
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Re: For those who drive a Hemi 5.7

It is also much more difficult to fill these "cap less" systems to the brim, than it is tanks with caps. It also specifically states in the manual NOT to continue filling after the nozzle "kicks out". Who knows where that is, because each nozzle is different. On my dual tank F-150, I can easily get another 2 to 3 gallons in each tank if I keep squeezing after it initially kicks out. I think the JGC has an even longer filler neck. The longer the neck, the bigger the PITA when trying to top it off.
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  #298  
Old 04-15-2016, 08:40 PM
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Re: For those who drive a Hemi 5.7

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Originally Posted by billt View Post
OK, I'll bite. What is a "CAI", and why does it destroy your mileage so badly?

A cold air intake doesn't destroy your mileage. It certainly won't make it any better either. Sound is the biggest thing you'll notice after installing. Throw on some headers, exhaust, and a good tune to bring your vehicle to life.


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  #299  
Old 04-15-2016, 08:45 PM
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Re: For those who drive a Hemi 5.7

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Originally Posted by Action View Post
Great post.

Not considering the v6 at all. Either the Hemi 5.7 or SRT ... or just an entirely different car.

Just wanted to see what the gas mileage numbers were to calculate long term costs.

Obviously it's a rough $ estimate considering gas prices can change - but I don't see it moving too crazy in this current global climate + electrical and economical car sales rising + cars becoming more efficient.

I test drove the SRT and the v6 - haven't test drove the 5.7 yet.

However that SRT MPG is atrocious from what I've seen. + about $15k - $20k more for the car.

The mpg's on the SRT aren't the best, but no one buys them for fuel economy. The 5.7's aren't great on gas either, but it's slightly better. I have both the 2014 SRT and my wife has the 2014 Overland with the 5.7. Both are fun to drive though.


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  #300  
Old 04-26-2016, 08:17 PM
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Re: For those who drive a Hemi 5.7

ImageUploadedByJeepGarage1461719799.468804.jpg

Grumble Grumble... My mechanic says he is going to check my spark plugs and air filter. My air filter is brand new and I don't have much faith that is the damn spark plugs...


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