No manufacturer claims their truck to be the most fuel efficient, because there are too many factors affecting this. Such claims are made in regards to the engines, but not to the trucks themselves. Detroit Diesel motors have been traditionally known for their fuel efficiency. Volvo makes a similar claim with their D series motors, although they only seem to live up to those expectations solely under ideal conditions.
The average fuel economy of a semi truck is between 5 and 7 mpg when loaded.
A fuel pump siphons the fuel through hoses.
4-8mpg of diesel depending on the year, condition, and modifications to the truck.
An aerodynamic cab one, like a Freightliner Cascadia, International ProStar or Volvo VN680.
You don't. The fuel system draws from both tanks concurrently.
Who invented the Semi-truck?
As the purpose of a semi truck's existence is to go cross country, the best semi-truck for a cross country trip would be the semi that suits your needs. The purchase decision would have to be based on several factors. These would include what is to be hauled, price and ease of maintainance and operation.
There hasn't really been a brand of semi trucks recognized as the most fuel efficient. Since they run on diesel a more efficient fuel, semi trucks already are more fuel efficient than cars in terms of size and power.
If the semi truck knocked on the garbage truck, yes.
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No. Recent advance in technology do not require idling of a semi.
You can find good deals on used semi trucks at www.autotrader.com.