Fueling a truck will depend on how big the fuel tanks are. Everyone here has stated specific sizes and there are a lot of variables involved when it comes to truck tanks and their capacity.
I have seen truck with two 40 gallon tanks to the last one I drove which had a pair of 150 gallon tanks. The purpose of the large tanks is not so you can go further, but so you can buy fuel where it is the cheapest. Most trucking companies have people who's only job is to track fuel prices and make sure that the fleet only buys fuel at the places where they can save money.
I ran for a company in 2006 that had 1200 trucks... the fuel bill from July to August, because of price increases, cost the company and extra $1,000,000.00 (million), just in fuel costs, for that month. Imagine what it is now.
Most average road trucks in the US will carry around 200 gallons of fuel... if you fuel at a 1/4 of a tank... That's still 150 gallons... times $4.00 + per gallon..... it gets a little spendy....
I hope this helps....
30 years and 2.5 million accident and violation free miles in a truck... I guess my source is personal experience... :-}