MPH vs MPG
I bought a 2022 Chevy 3500 6.6L Duramax Turbo Diesel and wanted to check the fuel economy for both towing and not towing. The numbers you'll see DO NOT include regen periods where the engine is burni...
Forum Discussion
valhalla360 wrote:
Now back to the subject:
- Wind often makes a huge difference. If we aren't on a schedule (and we usually aren't), I'll check the wind forecast. The difference between a 10mph tailwind and a 20mph headwind can easily be 30-50% worse MPG.
- I do a running total on our scheduling spreadsheet. The dash calculator is pretty consistent with my calculations. Where it's really useful is the instantaneous output rather than the long term average. If you see, the MPG is getting hammered by current conditions, you can take action (slow down, call it a day, etc...).
- The long term average is more of a planning number and I usually assume 10-15% less.
most of our speed limits here are 90Kph or 100 if your lucky so generaly I do the speed limit. in alberta where it is 110 it is a 2 lane road so I just stay in the right and do what I feel like doing, usaly 100 some times 90 if I am worried about fuel range.
yup so many factors, frontal area, shape of that area, how much space is between the back of the truck cab and the front of the trailer, speed, wind, and so on.. even the road surface can affect the roling resistance.
with my old short box diesel I used to get 14mpg towing my old 30 foot trailer which weighed 8000lbs loaded for camping, I went to a 12000lb 40 foot 5th wheel and my actual milage went up to 16mpg. the difference mainly was how close that front of the fifth tucked up close to the back window of the truck preventing a deag zone from forming between the truck and trailer. then I bought a new truck with a long box and that space increased by almost two feet and my milage dropped a bit, but its hard to coralate as its a different truck.
