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Old 07-27-2014, 04:32 PM   #1
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Real life MPG

I went from Oconomowoc WI to Hill City, SD. Here is my real life MPG for the trip. I have a 14 Silverado 5.3 4X4. I have a Oasis CK 21 footer. Drove back 346 miles from Hill City to Montrose, SD against 20-30mph head/side winds with 40 mph gusts. ]i only got 5mpg that sectionI have a Andersen no sway weight distributing hitch that works great.
I included a picture of my normal driving around MPG
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Old 07-27-2014, 04:33 PM   #2
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Camper weighs 4400lbs
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Old 07-27-2014, 04:44 PM   #3
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Have you done hand calculated numbers to compare to the digital read out? I bet it's close though.
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Old 07-27-2014, 04:59 PM   #4
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Not sure, are you complaining or elated ?!?;-)
IMHO mpg is secondary to a tool doing the Jon it was intended to do...

A Prius gets better mpg than my truck but not going to ask it to tow my 5er !
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Old 07-27-2014, 05:59 PM   #5
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Quote:
Originally Posted by jesilvas View Post
Have you done hand calculated numbers to compare to the digital read out? I bet it's close though.
X2. Check against the computer. I had an 08 Silverado 2500 with 6.0 litre gasser. Trip Computer showed 12-12.5 mpg driving on a trip to mountains not towing. I re fueled and did the math in my head and it didn't add up. Next trip up I re fueled and calculated by hand and barely got 10 mpg. Not very impressed. Only had that truck 4 months. Check by hand and make sure it's correct.

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Old 07-27-2014, 07:57 PM   #6
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Check by hand and make sure it's correct.
Chad, most people don't have a clue as to how to compute MPG by hand.

To do it right "by hand", you first must fill up to the cap with fuel. That's extremely hard to do at some fuel pumps and with some tow vehicles. For example, my '99.5 Ford diesel would hold about three to four more gallons after it clicked off. But most diesel pumps run so fast at the slowest speed that the pump clicks off again after about one tenths of a gallon more. So it required about 40 clicks - with a few seconds between clicks - to get liquid diesel (not foam) to the cap.

My F-150 gasser has the same problem, but it requires only two to three gallons more to fill up to the cap.

Reset the trip meter to zero, then you drive until the fuel gauge shows less than one quarter of a tank left, and fill up - to the cap - again.

You must know your odometer error. Adjust the miles driven by the odometer error, then divide by the corrected miles driven by the gallons used.

You can check the odometer error by using a GPS. Begin a new trip to somewhere at least 100 miles down the road, with the trip meter reset to zero at the start of the trip, and using the GPS reset for a new trip . When you get there, compare the miles per the trip meter to the miles per the GPS, and compute the percentage difference.

Or another way is to use the interstate highway mile markers. Put your front bumper on a mile marker and reset the trip meter to zero. Then drive exactly 100 miles per the mile markers (without crossing state lines or changing interstate highways) and compare to the miles driven per the trip meter. Compute the percentage of trip meter error, (which is the same as odometer error and speedometer error on newer trucks) and apply that percentage to the trip meter mileage when computing MPG.

There are no shortcuts if you want accurate MPG computation. You must fill up to the brim, both before and after the MPG run, and you must correct the miles covered to get rid of trip meter error.

When I do that I find that the lie-o-meter in my 2012 Lariat is very close to accurate. It's so close that I don't bother checking it more often that a coupla times a year.
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Old 07-27-2014, 08:00 PM   #7
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Not complaining or bragging, just showing you what I got. Usually MPG estimates from people are vague. My wife does have a Prius though, here is the best MPG it's ever got. (She only gets 42mpg due to a heavy foot)
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Old 07-27-2014, 08:11 PM   #8
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I get 7 towing and I don't care. My towing is from point a to b and I want safety, power, stopping power, comfort. MPG is least of my priorities.
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Old 07-27-2014, 08:24 PM   #9
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I get 7-8mpg on flat towing 6000lbs in a 2011 Silverado 5.3l and 5-7mpg going up thru mountains in AZ. I have double checked the computer and get the same numbers.
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Old 07-27-2014, 08:32 PM   #10
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Smokeywren, I will need to warn you about filling the fuel on a gasser to the cap. For one that is hard to do but the serious negative is fuel can get into the EVAP system and fill the carbon canister. Ford does warn about this procedure and I have had to replace a few carbon canisters through the years because of this practice.
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Old 07-27-2014, 08:52 PM   #11
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MPG is really a non-issue. These are houses on wheels. Most get somewhere between 8 and 13 loaded. Everyone knows going in that you're going to spend big for fuel. I get about 11-12 and I use that to figure my fuel stops. If I want to spend less on fuel I stay closer to home. If you really want a RV that gets good MPG get the MH on a Sprinter chassis with the diesel. I hear they get close to 16. So just fill it up and go, then fill it again, and again. I stopped backpacking a long time ago.
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Old 07-27-2014, 09:19 PM   #12
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I believe that... like the speedometers on boats... these trip computers are a touch "happy" when it comes to mpg. That sells trucks the same way it sells boats... My first fuel-up with my new Ram 2500 CTD showed 19.7 on the computer, but I did the math and came out with 18.7 overall. My biggest problem was that I did tow the TT about 30 miles at the top of this tank, and I'm not sure about having reset the trip odometer when I was at the pump. So, this time I filled it up to the second click off, reset the trip odometer, and will try again. Oddly, I fueled up Friday night when the fuel light came on, and it showed a range of 602. My commute is about 40 miles, and when I got there, it showed a range of 631 miles... Doing a bit of running around today and now it's showing 491, with the needle just below the full mark... I think it needs to make up it's mind... What I noticed about this is that when the mpg average in the bottom-right of the screen jumps up or falls, the range number changes accordingly. I'll know more about my mileage next weekend when I fuel up again. My '11 F-150 did a lot of the same stuff... but it recalculated the range figure differently. If the figure was needing to go up, it seemed to just not change for a long time...

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Old 07-29-2014, 09:35 AM   #13
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We just did 5,200 miles in three weeks with the TT around the Colorado Plateau and back to GA. The Ram CTD averaged right at 14mpg, incuding several climbs to 10,000'+ and 75mph on the highway.
Empty, I get 18 in town and 24 highway with EGR and DPF deleted. That's about 3-4mpg better than stock, so figure 14-20mpg on a truck with all the emissions junk.
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Old 07-29-2014, 11:03 AM   #14
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Quote:
Originally Posted by Oconomowoc View Post
Not complaining or bragging, just showing you what I got. Usually MPG estimates from people are vague. My wife does have a Prius though, here is the best MPG it's ever got. (She only gets 42mpg due to a heavy foot)
Attachment 69222
Wow, that's terrible. Does she have the touring package?? The wider 17" wheels drops you 2-3mpg. Does she not have her tires inflated to 40+psi?? That drops you 2-3mpg as well on the prius. Does she do mostly short trips?? It takes a few minutes for the prius to warm up, when it's warming up it only gets 35mpg for the first 3-7 minutes. So a short trip kill the fuel economy average.

I have a 2011 Prius as my daily driver. The prius display is usually about 3-4% optimistic, but hand calculated i usually average 48-52mpg. My worst was 46mpg in the winter.
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