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Question Fuel Mileage Check

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FWIW-It takes about 15-20,000 miles for the engine to fully run in (break-in) as that happens it will improve. However, you are hauling around a lot of weight, moving and keeping that weight in motion takes fuel. I have 16K on Ventana 3407, my dead weight is 30K, and I get between 7-10 MPG depending on terrain. I do not have near the engine you have. Every single one is different.
 
FWIW-It takes about 15-20,000 miles for the engine to fully run in (break-in) as that happens it will improve. However, you are hauling around a lot of weight, moving and keeping that weight in motion takes fuel. I have 16K on Ventana 3407, my dead weight is 30K, and I get between 7-10 MPG depending on terrain. I do not have near the engine you have. Every single one is different.
For a new engine, be it diesel or gas, I wouldn't be concerned with fuel or oil consumption for the first 10K miles. It is still tight and running tolerances for rings, bearings, and seals have not settled.
 
In my dreams I buy a diesel pusher. Having owned (Large) boats with twin diesels I am well aware of their attributes. However, I was also led to a DP because of increased gas mileage. Having read your accounts I find that's really not a consideration. My 8.1L Vortec gets a solid eight (8) mpg and maybe a bit better on a stretch of flat land. Still going to dream about a DP (of course), but I'm OK with a gasser at the same mpg as diesel.
 
In my dreams I buy a diesel pusher. Having owned (Large) boats with twin diesels I am well aware of their attributes. However, I was also led to a DP because of increased gas mileage. Having read your accounts I find that's really not a consideration. My 8.1L Vortec gets a solid eight (8) mpg and maybe a bit better on a stretch of flat land. Still going to dream about a DP (of course), but I'm OK with a gasser at the same mpg as diesel.
I too have had boats, both gas and diesel. The advantage is not mileage. Look at the cost of a gallon and how far that pushes your vehicle, be it a boat, towed RV, or motor home. That is the real number. Of course, there are the maintenance costs and longevity. There are lots of numbers to go into the formula. Then you know the real cost to own either one. Of course, the gas vs. diesel wars discussions have been going on for years.

Try a pair of 3208TA's pushing a 42 ft Fiberglas Clorox bottle through the water. 5 MPG would be GREAT! Try 0.7 MPG to 1.0 MPG at 30 kts., {34.5MPH} and it only hauls 400 gals {at the dock that's $1720 for a fill up} plus a skinny gal in a bikini.
 
My 2022 DS is getting between 6 and 7 with 4,000 miles on it so far. I’ve been on flat land for the most part but it seems I am more likely to see 7 with modified foot behavior. ;-). Need to break in the engine and my foot.

But, my trip computer only reports mpg to the whole number, such as “6.0”. Am I missing a setting somewhere or is this how it is supposed to work?
 
My 2022 DS is getting between 6 and 7 with 4,000 miles on it so far. I’ve been on flat land for the most part but it seems I am more likely to see 7 with modified foot behavior. ;-). Need to break in the engine and my foot.

But, my trip computer only reports mpg to the whole number, such as “6.0”. Am I missing a setting somewhere or is this how it is supposed to work?
I should have also mentioned that I've been towing a 6,100 lb GVWR Wrangler Rubicon for all those miles.
 

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