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The trucking industry is going crazy over efficiency. Like stated above, 1 mpg will save some companies >$5K/yr per truck. It's the flat deck and heavy haul (140,000 lbs in Canada) who don't care about aerodynamics, as it makes little difference for them.
I agree - hybrids would work great in the hills. But when we are talking 80K-140k lbs, there isn't a battery pack in the world that will fit in a truck and pull it even a tiny bit up a hill (especially the hills we have here in BC) before draining. I guess a little bit of "up hill battery help" would improve efficiency, but considering current HD hybrids cost $50K extra, it still wouldn't save $$$. But as fuel prices go up, that may change.
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