Quote:
Originally Posted by roflwaffle
In the strictly thermodynamic sense a fully loaded tractor trailer will be more efficient than a prius...
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Still a bit puzzled, but I'm not sure the highway-cruising SUV doesn't lose out there, too. That is, it's got a big engine (for acceleration, towing those 10,000 lb boats & camping trailers, etc), which in highway cruising would likely be running far from its optimum BSFC, so inefficient. Whereas diesel semi (as you know if you've ever followed on up a long grade) has engine HP more closely matched to cruising load.