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Old 06-05-2015, 03:51 AM   #41
Jlwright
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I would guess prevailing headwinds from the west dropping your gas mileage a little.
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Old 06-09-2015, 05:08 PM   #42
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Originally Posted by notanlines View Post
From www.fuelly.com, 2003 Silverado four door short bed, diesel: "Based on data from 37 vehicles, 1,021 fuel-ups and 323,994 miles of driving, the 2003 Chevrolet Silverado 2500 HD gets a combined average of 14.79 MPG with a 0.21 MPG margin of error. Uh, by the way, that was towing NOTHING. Hmmmm.....
Those numbers have to include city driving. I have many, many friends and family members who drive Dmax's, I'm on my second one. All of them from 2000-2015 seem to get 18-22 on the highway, 10-13 towing, and 14-16 around town. Numbers are pretty consistent regardless of who I talk to and what year they have. I've heard of people with tuners getting 23 and 14 (empty/towing). There isn't anyway anyone could convince me that the numbers on www.fuelly.com are strictly highway numbers, in fact, I'd have trouble believing they are anything other than city.

As for me, my 6.0 gasser with 4:11 gears got 16 highway, 13 city, 8-9 towing. My dmax 19-21 highway, 15 city, 10-12.5 towing. BTW, hand calculations and the computer on mine match. I can even look at the number of gallons of fuel used and it will math within 1 gallon when I fuel up. That's a max of 1 gallon variation over 80-85 gallons. I'd say that's pretty good. The computers are getting better.
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Old 06-19-2015, 07:26 PM   #43
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Today was the first long highway pull with our '13 Grand Cherokee Hemi and 238ML. The first tank of fuel from Denver to Silverthorne, over the passes, was 10.2 MPG. The second leg into Green River, UT was only 8.2. I had hoped for 10 again. I'm thinking it as the winds and temps up to 105. Yeah, it's hot over here. Tomorrow is onto Hurricane, UT.

The Hemi pulled like a champ the whole way.
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Old 06-20-2015, 05:11 AM   #44
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When we towed with our F150 and our F250 gas trucks, we always seemed to average between 8 and 11, usually closer to about 9.5 MPG. Any increase above 60MPH or any crosswind/headwind would dramatically affect mileage. It didn't seem to matter what length trailer was behind us. It was more a matter of the "frontal area square footage" and the speed rather than weight or length that affected mileage the most.

I'd say your 10.2 was a "good tank" and your 8.2 was probably close to your "bad tank" figures. Enjoy the trip, buying the gas is just a part of the price of having your "house with you"......
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Old 06-20-2015, 05:31 AM   #45
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When we towed with our F150 and our F250 gas trucks, we always seemed to average between 8 and 11, usually closer to about 9.5 MPG. Any increase above 60MPH or any crosswind/headwind would dramatically affect mileage. It didn't seem to matter what length trailer was behind us. It was more a matter of the "frontal area square footage" and the speed rather than weight or length that affected mileage the most.

I'd say your 10.2 was a "good tank" and your 8.2 was probably close to your "bad tank" figures. Enjoy the trip, buying the gas is just a part of the price of having your "house with you"......
Yeah, I get that. My 99 Yukon averaged 9.6 on our 5,600 mile trip last year. Was hopeful that this would get better overall. I'll know that once we've gotten home in 10 days and another 1,800 miles
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Old 06-20-2015, 02:51 PM   #46
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My MPG are by hand, start with full tank and "0" miles and calcuate when next fill up tank and miles driven.
I think adding by miles and gallons is more accurate then the computer usage. I'm at 21,500 cat weight with 2013 Duramax . This last 1700 mile trip in Texas hills I got 9,5 with the monitor . I think some fuel is better then other fuel look for the name brand station that change the filters out more often.
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Old 06-21-2015, 04:42 PM   #47
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Just got back from Grayland state Park 112 miles each way. I was heavy going out. Got right at 8.4 mpg. A bit lighter on the way back(lots of firewood gone ) I got 9.2. A few more down hill runs on the way back.
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Old 06-21-2015, 07:20 PM   #48
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Just to touch on Roadglide's remark about fuel quality;

We just returned from a 2 1/2 month trip to FL. Took I10 going in and stopped at the exit for Defuniak Springs for a fill up. About 5-10 miles after leaving my 6.4 was feeling like it was hopping or stumbling. I looked at the onboard fuel mileage and it was 1.5mpg less than it was before I filled up. Went on into our destination, filled up, put in STP gas treatment and the hopping, stuttering went away. It was OK for 2 1/2 months. Left for TX and stopped for gas at one of the exits close to the Defuniak Springs but not the same one. Same thing; in a few miles I was hopping and stuttering. I had taken a bottle of STP with me and put it in the tank.....problem solved, so yes, there is a definite issue with fuel quality that can kill your mileage.
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Old 06-29-2015, 04:02 PM   #49
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On our recent trip to the Collegiate peaks campground, outside of Buena Vista CO, we averaged 11.7 for the whole trip (almost 2K miles round trip) according to the truck's computer (which I have previously tested with hand calculations).

We had the Wife's parents with us for the return, they had flown up to visit her brother in Monument and met us in Pueblo for the ride home.

That mileage pretty much lines up with the almost 2K maiden voyage we took to the Big Bend region of TX, in April.

I am quite happy with the results and as others have said... I have all my own stuff with me and can camp anywhere the ground is mostly level.

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