The standard answer is 6mpg, but the real answer is "it depends on a lot of things."
Two days ago I hooked up to a load of Budweiser and pulled it through some really hilly terrain with an International 9400i. I got 6.2mpg. After I got rid of that I went to another place, loaded with a ton of molded styrofoam--it filled a 53-foot trailer--and got 9.7mpg over the same terrain. And once I pulled a load of car tires from Atlanta to Dallas--a fairly flat route--and got 11.8mpg. This is a truck with an automatic transmission, economy gears in the rear end and a 435-hp engine. If I had a 9-speed manual, hill gears or a smaller engine I'd get worse mileage. You're thinking, "don't you mean bigger engine?" Nope--a smaller engine would have to struggle more to get up the hills, and when you stress one of these engines it responds by sucking down diesel. The current fuel mileage champion gets over 11mpg ALL the time, and he's got a 600-horse engine. He barely has to crack the throttle on that thing to make it move.
They will range from 4 to 7 miles per gallon.
depending on the truck, the weight of cargo etc . the fuel milage can be anywhere from 4 mpg to about 9 mpg
Gas mileage can vary significatly due to a variety of circumstances. Its a safe bet that newer and more areodynamic models of Semi Trucks will offer the best in miles per gallon.
An aerodynamic cab one, like a Freightliner Cascadia, International ProStar or Volvo VN680.
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.
It depends on if you mean the Volvo semi trucks or SUV. The best semi is the VN430 and the VHD.
Things like semi-trucks and some trucks and every day vehicles use diesel fuel.
According to the Elmo Kandel, Editor and Publisher of Article Click, a highly efficient semi-truck will get 6 to 8 miles per gallon. Fuel mileage will vary greatly based on the weight of the truck and payload and environmental factors such as wind and grade. Fuel mieage can drop to 4 miles per gallon in less efficient trucks - you need to go to www.fairtran.com to find out more.
A row of semi trucks. There isn't a specific name for it.
3-6 mpg
You can go to commercialtrucktrader.com to get a quote for your used semi trucks.
If they have a sleeper berth, yes - one for the driver compartment, and one for the sleeper berth.