Question 2024 Dutchstar fuel economy

[DennisT]

They do go up as you get more miles.

I use Road Trip app, saves data to iCloud account instead of another.

Last year headed to FL for winter.

 

[team bradfield]

If you do much traveling in the mountainous west expect to see at least a 10-12% drop from the numbers you are seeing at a minimum.

Yep, we averaged 6 through Wyoming last fall, going west, about 8 heading east, strong westerly winds in Wyoming

 

[JRS]

I try to stay at 65-66mph but can't seem to break 7.25 mpg and at about 40K total miles on the rig now.....
Rig runs well, no DEF head issues, etc and the rig has been reliable. I can't complain and don't just don't worry about it.
At stop lights, when it turns green, I do punch it which doesn't help.
I mean I wish I gain more but let’s look at the math. Now below is after a couple of cocktails...

8000 average miles driven over 5 yrs

8000 @ 7.25 mpg equates to 1103 gals of fuel burned
8000 @ 8.25 mpg equates to 970 gals of fuel burned (would love to get 8.25!)

So we're looking at a 133 gallon burn difference. At 133 gals x $4.50/gal cost of diesel I'm looking at a $598.50 difference....

 

[Kevin D Pem]

Yep, we averaged 6 through Wyoming last fall, going west, about 8 heading east, strong westerly winds in Wyoming

Strong wind current from the west, always, from the Mississippi to the coast. Also the rise in elevation. The trip home should almost average out!!!

 

[Cameodon]

I did not read this entire thread, only the first 5-6 posts. & m.p.g. is great mileage , in my mind. Unfortunately I would never see it, I simply can not do this 60-65 aprox mph. I guarantee my mileage would be more like 6-6.5 at best.try 55-60, you'll probably get 8+ mpg.

 

[Cameodon]

Following I copied and pasted from the TIRE EASY web page stating MAX cold air pressure on the Hercules 901-H 14 ply trailer tire. Again this is MAX Cold air pressure. at 110 psi these tires are rated at 3750 lbs per tire! That relates to 1500lbs. 4 tires. My 5th wheel weighs 13000lb + fully loaded with 3000lb+ of that on the pin, I scaled it. So that means approx 10,000 lbs total on the 4 tires.......I run 90lbs cold. Tires have 0 squat. They have around 10,000 miles on them and show perfect even wear. By wear I mean with the naked eye I can't see any!! Again any tires I have read say MAX cold air pressure. My truck, 2020 F-250 say MAX cold AP 80. Not towing it will beat your teeth out at 80 cold psi. I run 55 cold empty 70 towing. 44,500 miles on tires. I could get another 10,000 if I wanted.



Max Single Air Pressure(PSI)

110

The maximum air pressure this tire will support. This does not represent the amount of air pressure your tires should have at all times. Consult with your owner's manual to determine the best air pressure you should use for your vehicle.

 

[Cameodon]

They do go up as you get more miles.

I use Road Trip app, saves data to iCloud account instead of another.

Last year headed to FL for winter.

View attachment 24040

You must of been using Premium at those prices or was it diesel? Also curious, speed???

 

[DennisT]

You must of been using Premium at those prices or was it diesel? Also curious, speed???

That was the pump price for diesel and they were discounted after using the EFS card.

Normally run between 60 and 65 mph when traveling.

 

[Neal]

@Joe Hogan I suggest performing this test. Diesel fuel, especially at the high rate of a truck pump can generate a lot of foam and easily throw off your mileage calculations.

Stop 1: At about 20 gals prior to full slow down your fill speed to about half. With around 10 gals remaining, slow it further. Goal is to minimize foam. Maybe even wait a minute or so and then try to get as much diesel in as possible to ensure a full tank.

Stop 2: Repeat above. Now measure your mileage. Report results.

 

[Kevin D Pem]

@Joe Hogan I suggest performing this test. Diesel fuel, especially at the high rate of a truck pump can generate a lot of foam and easily throw off your mileage calculations.

Stop 1: At about 20 gals prior to full slow down your fill speed to about half. With around 10 gals remaining, slow it further. Goal is to minimize foam. Maybe even wait a minute or so and then try to get as much diesel in as possible to ensure a full tank.

Stop 2: Repeat above. Now measure your mileage. Report results.

Damn you would bring up tank level!!!

 

[Stuart W]

@Joe Hogan I suggest performing this test. Diesel fuel, especially at the high rate of a truck pump can generate a lot of foam and easily throw off your mileage calculations.

Stop 1: At about 20 gals prior to full slow down your fill speed to about half. With around 10 gals remaining, slow it further. Goal is to minimize foam. Maybe even wait a minute or so and then try to get as much diesel in as possible to ensure a full tank.

Stop 2: Repeat above. Now measure your mileage. Report results.

100% Neal, agreed there are so many variables. One big one you brought up about fuel-fill rate and foam, on a 100 or 150 gallon tank a slant on the isle could equal a significant difference in volume. Earlier in this thread generator and Oasis fuel consumption came up, I believe the MPG calculations are simple tank float level fuel volume Divided by miles driven, so if your cranking 3 AC’s running the generator cruising down the road on. 100 degree day your MPG will suffer.
My two 4369’s pretty much averaged 6.8 MPG but on a rare occasion when my route was mostly on the flat or downhill I saw 8.2 one time, by my next check it was 6.8.

 

[DennisT]

Generator and Oasis definitely make a difference, especially when sitting for 6 months and exercising both.

On the 400 miles from Florida to Hilton Head we got 6.77 mpg which includes all the generator and oasis fuel used while parked.

 

[Neemer]

There’s also a variation in how level your rig is when you fill. I just calculated mpg on my trip to Nappanee. Two fuel-ups, one 5.7 the other 7.03. So, my fuel mileage is yes.

 

[Kevin D Pem]

Short of using a fuel flow device in the fuel line to the engine i.e. ECM, there are to many variables! Gas has advantages! Fill up till the auto shut-off triggers. Fuel in neck,no air in tank, level no problem! Did I mention temperature variables?

Yup!!! Fuel metering at the fuel user, is the only accurate way!!!

However, mechanical wear, and inaccuracies foil any real numbers on that battle front as well!!! Other than bragging rights, I look at fuel economy,the same way I look at solar,and battery monitoring!!!

It all comes down to this one important question! is it working for you???

 

[Joe Hogan]

This all comes down to how accurate does the calculation need to be.
Our last pair of fill ups were from the same pump at Loves, same time of day approximately. Using same fill technique. Probably as close to accurate as I need to be.
That said, the number I watch is the average mpg. If there starts to be an unexpected decline without known reasons, I start to look for a cause. Mechanical issues, etc.