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Author Topic: Calling All PC Owners With "True Average" Fuel Economy Figures  (Read 818 times)
ron.dittmer
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« on: March 26, 2012, 05:24:58 pm »

Please Do NOT post one or two time fill ups, short trips, Scan-guage read-outs, head or tail winds.  You are free to share that in other threads.
Lets post solid figures here for us and prospective patrons to read how our areo-dynamic rigs do with fuel consumption.

If you have tracked your fuel economy accurately over thousands of miles, please share your figures with the rest of us.  Be sure to include the following
- The year and model of your PC
- The chassis and chassis year (E350, E450, Sprinter)
- Dry weight of your PC as stated on the PC sticker
- Towing, No or Yes (if yes, what exactly including weight of tow)
- Miles driven
- Top practiced speed limits
- Type of fuel generally purchased (Octane -Low, Mid-grade, High)
- how your figures were calculated

----------------------------------------------------------------------------------------

For Me....

2007 PC-2350
2007 E350 with V10 engine
9200 pound dry weight (no slide out)
Towing, see below
Miles driven, see below
Practiced speed limits, see below
Always the lowest octane sold (87 in most places, 85 at high altitude places)
Fuel economy, averaged from the gas station near home, back to that same gas station, keeping accurate record of gallons purchased along the way.

Trip "A"  (during break-in period...if there is such a thing as a break-in period anymore)
- towing a 2200 pound, 2000 Toyota MR2 Spyder, 100% of the time.  This means that all locally driven miles are done with the car.  The PC stayed parked at camp sites.
- 5039 mile journey from Chicago, to San Francisco, to Las Vegas, and a lot of places in between.  Highway, mountain and canyon driving combined.
- top speed is consistently 5 mph over posted speed limits when towing, but never exceeding 70mph.
Averaged over the 5039 miles driven = 9.5 mpg

Trip "B"
- towing 4300 pound, 2006 Jeep Liberty 4x4, 100% of the time.  This means that all locally driven miles are done with the 4x4.  The PC stayed parked at camp sites.
- 3826 mile journey from Chicago, to Jasper Alberta and a lot of places in between.  Highway & mountain driving combined.
- top speed is consistently 5 mph over posted speed limits when towing, but never exceeding 70mph.
Averaged over the 3826 miles driven = 9.2 mpg

Trip "C"  (very short trip, almost doesn't meet my own criteria)
- Not towing anything so all driving was done with the motor home.
- shorter trip of about 800 miles, 700 highway, 100 local.
- loaded up with 5 adults for a wedding.
- typical cruising speed was 65mph on the open road interstate driving.
Averaged over the 800 miles driven = 10.2 mpg

These figures are as accurate as I could get with no fluff of any kind.  Actually I favored worse economy when averaging 10ths of gallons, so if anything my true fuel economy is better than stated.
« Last Edit: March 26, 2012, 05:37:03 pm by ron.dittmer » Logged

Ron Dittmer (wife Irene) 2007 Model 2350 Without A Slideout
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aimee
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« Reply #1 on: March 26, 2012, 05:27:36 pm »

I just wanted to clarify, when you say, "Please Do NOT post one or two time fill ups, short trips, Scan-guage read-outs, head or tail winds.  You are free to share that elsewhere."  you mean in this particular thread, correct?  Because we welcome postings of all kinds on the forum.
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ron.dittmer
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« Reply #2 on: March 26, 2012, 05:30:08 pm »

Oh absolutely Aimee.  Let me fix that.

.............How is that?
« Last Edit: March 26, 2012, 05:31:55 pm by ron.dittmer » Logged

Ron Dittmer (wife Irene) 2007 Model 2350 Without A Slideout
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billy
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« Reply #3 on: March 26, 2012, 06:01:24 pm »

I'm sorry you are asking more then my attention span can handle.      pulling hair out pulling hair out pulling hair out
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Insanity: Doing the same thing over and over and expecting different results.
ron.dittmer
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« Reply #4 on: March 26, 2012, 08:22:35 pm »

I'm sorry you are asking more then my attention span can handle.      pulling hair out pulling hair out pulling hair out
Billy ol buddy, I admit it can look like a lot of gobble-dee-goo.  You only have to look at the "bold" figures.  If you wonder why I got over 10 mpg one time, and 9 mpg the other time, then you can read deeper.  If you had your own figures that were very different from mine, then you could compare with my data to help determine why the differences.

I hope to do a little better by slowing down and refrain from using the cruise control, just to see what happens.  At 50 cents a mile now, it is worth performing the experiment.  I am also thinking of investing in a Scan Guage just to help me find the best mpg sweet spot, not to calculate actual fuel economy.
« Last Edit: March 26, 2012, 08:37:42 pm by ron.dittmer » Logged

Ron Dittmer (wife Irene) 2007 Model 2350 Without A Slideout
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Barry-Sue
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« Reply #5 on: March 26, 2012, 09:11:34 pm »

Started to record data at 1,206 miles.  90% freeway miles 10% primary and secondary roads (estimated).

2008 PC 2350
2008 E350 W/V10
9,555 Dry Weight
Towing - Yes - 2,700 pounds
9,148 Miles Driven
60 MPH Freeway; posted speeds (max 60) on primary and secondary roads
87 Octane
9.989 Miles Per Gallon ( 9148/915.8)

Barry
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bigbadjc
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« Reply #6 on: March 26, 2012, 09:19:41 pm »

Ron, I'll be interested in seeing what you conclude about the use of the cruise control.  I tend to use the cruise control when possible in the belief it should drive more steadily than I do and possibly improve mileage.  However, in hilly country I have found if you want to use the cruise control, you must use the tow/haul button on the automatic transmission.  Otherwise, everytime you come to a hill, the tranny will downshift too far and really rev the engine.  I've had good luck in cruise on hills using the tow/haul function.

Another variable you may encounter is gasoline formulation.  All gasoline in the USA is blended to a standard spec, but certain things do vary.  If ethanol is added, it will reduce your gas mileage because ethanol does not have the same heat content as mogas.  Also, you should get lower MPG in winter because the mogas gets loaded up with butane to give it better warm up qualities and make a crapload of extra money for the oil company.  I just point this out because it puts a little noise in your attempting to figure out the whys and wherefores of getting good mileage.

Jerry
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pyrthkr
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« Reply #7 on: March 27, 2012, 08:13:06 pm »

Records kept for 2 PCs:

2008 2551
E450 Super Duty (Triton 10)
Dry weight not recorded
did not tow
~14K mi driven
mostly 62mph; cruise on Hwys,
87 octane "regular"
just over 10mph for everything (once got 11.9 but also had alow outlier of 8.9)

2012 2552
E450 Super Duty (Triton 10)
Dry weight per sticker (but it's currently at my garage)
tow a 2012 Honda Fit
~2K driven w/o tow; ~300 w/tow
59-60mph; cruise on Hwys
87 octane "regular"
8.9mph either way (must not have enough data/miles to notice separation)
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keelhauler
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« Reply #8 on: April 02, 2012, 09:47:18 pm »

Phoenix Cruiser Model 2551 2006 F350 - 45K miles

I keep track of every drop of gas I use.
Drive near the speed limit, no toad.
Try to stay below 65mph unless I have to go faster to stay up with traffic.
Usually have a kayak on top.
Seldom use on short trips.
Average just over 10mpg since new.  exactly!
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John
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« Reply #9 on: April 03, 2012, 08:17:10 pm »

2551 2006 450 W/ slide, Towing 7,000lb box trailer, probably at max GVW,  long trips, mostly interstates, 65-75 MPH... under 8MPG... For trip planning I use 7MPG, calculated form about 20,000 miles,  I love this thing!

I hope this helps
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