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Old 03-27-2021, 04:42 PM   #29
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Watch your turbo boost gauge. Every time you build boost, you also sucked more fuel.
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Old 03-27-2021, 08:46 PM   #30
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I seem to find my sweet spot to be real close to 63 mph. The rpms are about 1,600 rpm. This seems to be my max torque. I have also notice a lot of trucks seem to be in the band and travel at the 63-65, even whe when speed limits are 70 and 75.
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Old 03-28-2021, 08:21 PM   #31
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Pretty simple really
up hill = bad
down hill = good
headwind = bad
tailwind = good
driving faster = bad
driving slower = good
heavy right foot = bad
light right foot = good
This is all there is to getting good mpg
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Old 03-29-2021, 11:28 AM   #32
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Hey, don't forget:
Going East = Bad
Going West = Good

You are driving against the earths rotation heading East . . .

And watch out for the space lasers!
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Old 04-01-2021, 03:17 PM   #33
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I agree with Tuffr2 I did not buy an RV to get good fuel mileage. I bought it to enjoy comfort the way we like it. I understand that the cost of fuel and everything changes your trip. but I was told early on if you play you pay. when I bought my truck I checked the mileage out of curiosity. found 9 - 10 was were it was at. after that I just drive what feels most comfortable. depending on road conditions traffic level and certainly wind. my personal sweet spot is running 68-72. that even stood good when I drove commercially.
I stay in the right lane until I have to pass somebody.
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Old 04-01-2021, 03:22 PM   #34
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Quote:
Originally Posted by HiWay-OurWay View Post
Hey, don't forget:
Going East = Bad
Going West = Good

You are driving against the earths rotation heading East . . .

And watch out for the space lasers!
Going south =good Going north =bad Going down =good Going up = bad
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Old 04-01-2021, 03:23 PM   #35
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Commercial trucks have been governed for years. almost every fleet truck will max out in the 65-67 range. some company even put different buttons in the system to restrict fuel even farther. that is why some trucks take miles to get up running speed. thick about it if you own 1,000 fleet rucks running 15,000 -20,000 miles a month and you can squeeze an extra mile per gallon on every truck that can make millions of dollars of difference in fuel cost.
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Old 04-01-2021, 03:29 PM   #36
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Going south =good Going north =bad Going down =good Going up = bad
Driving Mercedes sprinter 60 miles per hour = 18 miles per gallon
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Old 04-01-2021, 03:32 PM   #37
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I have driven that particular stretch of road many, many times. It's a tougher climb than it sounds. It doesn't really matter what I am driving, my mileage always goes down significantly when driving north on that stretch. There's usually a stout headwind when driving in that direction too. I think that has more to do with it than your speed, although certainly speed is a factor.

Next time you travel on that road, try going slower on the north leg and faster on the south. I'd be interested to know the mileage difference.
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Old 04-01-2021, 03:32 PM   #38
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I have the same truck/engine - pulling a 42' Toy Hauler - about 16,000# - get about 7.6 mpg @ 65-70 (how does song go? "can't drive 55")
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Old 04-01-2021, 03:36 PM   #39
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Here is a chart from Cummins that explains it

Click image for larger version

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Old 04-01-2021, 03:53 PM   #40
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I don't think that is unusual. We had a difference of around 40% with our RAM 3500 comparing approximately 60 MPH to 70MPH on several trips.
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Old 04-01-2021, 04:35 PM   #41
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Wideglide...7.6 is something I use to dream about. Now I just forget it, and enjoy it like you probably do. MOMCAT
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Old 04-01-2021, 04:41 PM   #42
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Quote:
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ArtJoyce
Commercial trucks have been governed for years. almost every fleet truck will max out in the 65-67 range. some company even put different buttons in the system to restrict fuel even farther. that is why some trucks take miles to get up running speed. thick about it if you own 1,000 fleet rucks running 15,000 -20,000 miles a month and you can squeeze an extra mile per gallon on every truck that can make millions of dollars of difference in fuel cost.
Thereís a place somewhere on earth where 18 wheelers go 65 mph?

Cant say Iíve ever seen it... just drove home every truck was going 75 keeping up with a traffic...
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