Quote:
Originally Posted by Jcp385
4-6mpg is all you'll see in a semi. Maybe closer to 8ish unloaded
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I'd like to amend this statement...I have seen as high as 8.5 in my truck, fully loaded, but that's if I keep it rolling for 4+ hours straight on decent roads. 7.5-8mpg is more common. Urban driving kills these trucks' fuel economy, much more than any car I have driven on a % basis.
Unloaded, you'll get about 11mpg. Bobtailing I have seen 12-14.
If you're shifting, you're wasting fuel in a semi.
Numbers above have been from a '14 Freightliner Cascadia, DD13/500hp engine with tag axle and Eaton 10-speed over the last 40k miles. Lightweight model, has a slightly shorter sleeper and only one fuel tank. The company limits speed to 60mph on cruise, 63mph hammer down.
zeusstx 
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