The price one should pay for a used Kenworth T800 varies based on the truck's year and average sale price. For example, a used 2010 Kenworth T800 has an average price of $73,161 compared to $52,378 for the 2005 model, according to Truck Paper, as of April 2015.
Kenworth T800s are a good deal if the truck is near the average price range for the year specified and the vehicle is in good condition. The average price for any used Kenworth T800 model-year is automatically calculated and displayed on Truck Paper, based on the site's listings.
The official resale price of a Kenworth T800 is available at The Truck Blue Book, though users must either pay for a subscription or buy a single valuation for pricing results to be displayed.