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Old 06-04-2017, 12:33 PM   #1
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Just How Far?

I'm an interloper here. I'm actually a Forrester owner but in the next month we are going to be a Dynamax Force 37 TS HD owners. (the one with the 8.9 liter engine)

My inquiry is about mpg. Just approximately how far can you go on a 100 gallon tank of diesel? It seems that this would be a topic for discussion but I can't find anything on it.

Not that it's critical but it would help in planning trips.
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Old 06-04-2017, 02:49 PM   #2
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Seems like I have seen anywhere from 10-12 mpg for fuel economy
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Old 06-04-2017, 07:03 PM   #3
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That question has way too many variables.
Load, terrain, wind, driving habits,
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Old 06-04-2017, 07:11 PM   #4
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I have a 2015 DX3 with the 8.9, I have done trips through WV. Western PA. and Pittsburgh to Hilton Head and back. I run 65 to 70 and have gotten around 8.5 to 9.5 all the time.
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Old 06-04-2017, 09:29 PM   #5
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Originally Posted by Webefine View Post
I have a 2015 DX3 with the 8.9, I have done trips through WV. Western PA. and Pittsburgh to Hilton Head and back. I run 65 to 70 and have gotten around 8.5 to 9.5 all the time.

I have a 2017 DX3 and I do pretty much the same thru Western Md and into WV with tow.
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Old 06-05-2017, 12:26 PM   #6
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Come on, let's keep it friendly. The site team deleted some off-topic and insulting posts.
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Old 06-05-2017, 02:20 PM   #7
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On the low end figure 7 mpg. I run at 75 with a trailer sometimes and that's the lowest I've seen. Usually run closer to 8 though. I'm sure I could get 10-12 if I wanted but with time being my limited resource I'd usually prefer to get there faster, and when you head west you're not even speeding at 75.
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Old 06-05-2017, 02:28 PM   #8
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I get 12 hauling 8500lbs with a 6.6L Duramax.
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Old 08-22-2017, 03:23 PM   #9
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2017 Force 37BH HD....I averaged right around 7 mpg on my last trip. 2,300 miles, 6 family members and a dog, towing ~8K, from Denver to OR coast and back...so a lot of hilly terrain at altitude. I was running at a pretty good tick most of the time, 70'ish.

From Cummins (https://cumminsengines.com/uploads/d...el_economy.pdf)

Rock-Solid Rules:

1. Above 55 mph, each 1 mph increase in vehicle speed decreases mileage by 0.1 mpg.
2. Every 10 psi of underinflation represents approximately 1% penalty in fuel economy.
3. Every 2% reduction in aerodynamic drag results in approximately 1% improvement in fuel economy.
4. Worn tires provide better fuel economy than new tires, up to 7% better fuel economy.
5. Used lug drive tires can get up to 0.4 mpg better than new lug tires.
6. Ribbed tires on the drive axles provide 2–4% better fuel economy than lugged tires.
7. The break-in period for tires is between 35,000 and 50,000 miles.
8. Tires make biggest difference in mpg below around 50 mph; aerodynamics is the most important factor over around 50 mph.
9. The most efficient drivers get about 30% better fuel economy than the least efficient drivers.
10. Idle time is costly. Every hour of idle time in a long-haul operation can decrease fuel efficiency by 1%.
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Old 08-22-2017, 08:24 PM   #10
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When you buy yours, put a scan gauge in it as well to monitor fuel burn, fuel remaining, distance to empty etc
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Old 08-23-2017, 06:44 AM   #11
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We've had our 2018 37TS Force HD since April. We've put 8K miles on it with trips to Wyoming, Indiana, Maine and the Maryland shore. I'm averaging right around 8.5 mpg right now and know it will only get better. We've owned a 6.7L Super C and now the 8.9L. It has always been that case that the driver needs a break before the tanks need fuel. :-)

X2 on the ScanGuage. It gives you better planning capabilities and piece of mind.
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