Navistar International Corp, is the owner of both International Trucks, and International Engines. They are known for the DT466, DT466E, and the MaxxForce DT. These are very reliable engines that many times outlast the truck itself.
Assuming the truck has a 300-gallon fuel tank, and an average of 7 mpg, the truck would travel approximately 2100 miles on a tank of fuel. Of course, fuel tank sizes, and fuel efficiency may differ.
On the average, a semi will last 750,000 miles or more. Some hit the million-mile mark with good care and regular maintenance.
Peterbilt is highly regarded as the better, more reliable truck. They are also quite a bit more expensive. So, International may not be quite as reliable, but is also more affordable.
"Harley-Davidson is the finest company in the world." - Evel Knievel