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Old 08-12-2012, 06:45 AM
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V8 MPG impressive

Took a long drive (3 hours and 3 back) to PA. From Mahopac NY we did just over 21 MPG and on the way back just under 23 MPG. I used adaptive cruise at an average of 75 MPH.

Around town the MPG drops to 13-15 MPG, but we don't do that kind of driving often.

On a sad note I banged the door of the new Overland and it's dented! Oh well. It was my fault and by Wednesday it'll be fixed and a memory. Sheesh, I set my own world record for damaging a new car: less than 4 days! Thank god for talented body work guys.

Meanwhile: the Overland is impressing everyone who sees it. Obviously I'm in the early stages of the honeymoon, but WOW, what a great truck!



Robert
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Old 08-12-2012, 08:17 AM
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Re: V8 MPG impressive

CaptRB, my experience with my new Overland Summit has been identical...22+ mpg on the highway on cruise. I'm a happy camper.

Sad to hear about your dent. That bites! Stuff happens...
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Old 08-12-2012, 12:14 PM
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Re: V8 MPG impressive

Are y'all measuring the MPG on the dash computer or the old fashioned way - actually computing it from gas receipts? The reason I ask is my '12 JGC Altitude thinks we are averaging 24.9 life to date, but we are really at 22.17. The computer on my dash is just a bit optimistic.
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Old 08-12-2012, 01:37 PM
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Re: V8 MPG impressive

My EVIC display and pump calculated are close, but the EVIC display is based on the previous 100-200 miles or so (or last reset), not a full tank or life like some other cars. So depending on pump timing the display could be optimistic or pessimistic. It is more difficult than it seems to be comparing apples to oranges.

Either my driving style changed, or perhaps there is breakin programing, but at about 5000 miles the jeep seemed to become much more spirited, but the mileage suffered. I don't think I've seen 23 mpg recently, but 21 is routine on trips. near 30,000 miles on her now.
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Old 08-12-2012, 01:56 PM
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Re: V8 MPG impressive

Glad to see your happy with your MPG. Doesn't seem anything but normal as its on par with the advertised mpg ratings, but as long as your happy ;-)
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Old 08-12-2012, 03:47 PM
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Re: V8 MPG impressive

Quote:
Originally Posted by Shutterbug57 View Post
Are y'all measuring the MPG on the dash computer or the old fashioned way - actually computing it from gas receipts? The reason I ask is my '12 JGC Altitude thinks we are averaging 24.9 life to date, but we are really at 22.17. The computer on my dash is just a bit optimistic.
You know they are doing it from the EVIC..... the wrong way. I have never owned a car that had the computer spot with the MPG that I am really doing. Even driving 30 miles on the freeway and filling it back up, my computer was wrong.
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Old 08-12-2012, 07:50 PM
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Re: V8 MPG impressive

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Originally Posted by Knightrider03m View Post
Even driving 30 miles on the freeway and filling it back up, my computer was wrong.
How did you know you got the exact amount of fuel in the tank for the 30 mile run, same fuel temp, same gas station, same altitude. Just a little bit of deviation makes a big discrepancy. How do you know the EVIC is using the same ground rules? I always get a kick out of the misinformed and sloppy data collectors trying to justify what they see, or just seeing what the want. Tank to tank fuel usage calculations are only good for long term trending. Trying to do a relatively instantaneous measurement with valid results is useless.

Now the EVIC will tell you how much fuel the computer thought it squirted into the cylinders over the distance, but it is not going to notice anything extra getting by the injectors. So more likely than not it will be optimistic. Its useful, however, as feedback to what driving styles provide the best mpg.
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Old 08-13-2012, 05:19 AM
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Re: V8 MPG impressive

I keep detailed mpg spreadsheets for all my vehicles and usually don't fill up till the gast tanks are 3/4 to nearly empty. I've got two other vehicles that also tell mpg's and the Jeeps EVIC is the worst out of the 3, usually 2 mpg's off but has been as bad as 3 mpgs or as good a 1 mpg off (always more than hand calculated). My chevy is usually .5 to 1 mpg off to the plus side. With the V6 I have a running average of 23.23 mpg's with a best of 25.2 and the worst being 21.1. This is about 70% interstate driving.
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